diff --git a/src/Formulario.ts b/src/Formulario.ts
index 2cc564c..90f046e 100644
--- a/src/Formulario.ts
+++ b/src/Formulario.ts
@@ -1,22 +1,22 @@
 import { VueConstructor } from 'vue'
 
-import { has } from '@/libs/utils'
-import rules from '@/validation/rules'
-import messages from '@/validation/messages'
 import merge from '@/utils/merge'
+import validationRules from '@/validation/rules'
+import validationMessages from '@/validation/messages'
 
 import FormularioForm from '@/FormularioForm.vue'
-import FormularioInput from '@/FormularioInput.vue'
 import FormularioGrouping from '@/FormularioGrouping.vue'
+import FormularioInput from '@/FormularioInput.vue'
 
 import {
     ValidationContext,
-    ValidationRule,
-} from '@/validation/types'
+    CheckRuleFn,
+    CreateMessageFn,
+} from '@/validation/validator'
 
 interface FormularioOptions {
-    rules?: any;
-    validationMessages?: any;
+    validationRules?: any;
+    validationMessages?: Record<string, Function>;
 }
 
 // noinspection JSUnusedGlobalSymbols
@@ -24,15 +24,12 @@ interface FormularioOptions {
  * The base formulario library.
  */
 export default class Formulario {
-    public options: FormularioOptions
-    public idRegistry: { [name: string]: number }
+    public validationRules: Record<string, CheckRuleFn> = {}
+    public validationMessages: Record<string, Function> = {}
 
     constructor () {
-        this.options = {
-            rules,
-            validationMessages: messages,
-        }
-        this.idRegistry = {}
+        this.validationRules = validationRules
+        this.validationMessages = validationMessages
     }
 
     /**
@@ -47,47 +44,38 @@ export default class Formulario {
         this.extend(options || {})
     }
 
-    /**
-     * Produce a deterministically generated id based on the sequence by which it
-     * was requested. This should be *theoretically* the same SSR as client side.
-     * However, SSR and deterministic ids can be very challenging, so this
-     * implementation is open to community review.
-     */
-    nextId (vm: Vue): string {
-        const path = vm.$route && vm.$route.path ? vm.$route.path : false
-        const pathPrefix = path ? vm.$route.path.replace(/[/\\.\s]/g, '-') : 'global'
-        if (!has(this.idRegistry, pathPrefix)) {
-            this.idRegistry[pathPrefix] = 0
-        }
-        return `formulario-${pathPrefix}-${++this.idRegistry[pathPrefix]}`
-    }
-
     /**
      * Given a set of options, apply them to the pre-existing options.
      */
     extend (extendWith: FormularioOptions): Formulario {
         if (typeof extendWith === 'object') {
-            this.options = merge(this.options, extendWith)
+            this.validationRules = merge(this.validationRules, extendWith.validationRules || {})
+            this.validationMessages = merge(this.validationMessages, extendWith.validationMessages || {})
             return this
         }
-        throw new Error(`VueFormulario extend() should be passed an object (was ${typeof extendWith})`)
+        throw new Error(`[Formulario]: Formulario.extend() should be passed an object (was ${typeof extendWith})`)
     }
 
     /**
      * Get validation rules by merging any passed in with global rules.
      */
-    rules (rules: Record<string, ValidationRule> = {}): () => Record<string, ValidationRule> {
-        return { ...this.options.rules, ...rules }
+    getRules (extendWith: Record<string, CheckRuleFn> = {}): Record<string, CheckRuleFn> {
+        return merge(this.validationRules, extendWith)
     }
 
     /**
-     * Get the validation message for a particular error.
+     * Get validation messages by merging any passed in with global messages.
      */
-    validationMessage (rule: string, context: ValidationContext, vm: Vue): string {
-        if (has(this.options.validationMessages, rule)) {
-            return this.options.validationMessages[rule](vm, context)
-        } else {
-            return this.options.validationMessages.default(vm, context)
+    getMessages (vm: Vue, extendWith: Record<string, Function>): Record<string, CreateMessageFn> {
+        const raw = merge(this.validationMessages || {}, extendWith)
+        const messages: Record<string, CreateMessageFn> = {}
+
+        for (const name in raw) {
+            messages[name] = (context: ValidationContext, ...args: any[]): string => {
+                return typeof raw[name] === 'string' ? raw[name] : raw[name](vm, context, ...args)
+            }
         }
+
+        return messages
     }
 }
diff --git a/src/FormularioForm.vue b/src/FormularioForm.vue
index e637165..eea8872 100644
--- a/src/FormularioForm.vue
+++ b/src/FormularioForm.vue
@@ -6,15 +6,8 @@
 
 <script lang="ts">
 import Vue from 'vue'
-import {
-    Component,
-    Model,
-    Prop,
-    Provide,
-    Watch,
-} from 'vue-property-decorator'
-import { cloneDeep, getNested, has, setNested, shallowEqualObjects } from '@/libs/utils'
-import merge from '@/utils/merge'
+import { Component, Model, Prop, Provide, Watch } from 'vue-property-decorator'
+import { clone, getNested, has, merge, setNested, shallowEqualObjects } from '@/utils'
 import Registry from '@/form/registry'
 import FormularioInput from '@/FormularioInput.vue'
 
@@ -24,7 +17,7 @@ import {
     ErrorObserverRegistry,
 } from '@/validation/ErrorObserver'
 
-import { ValidationErrorBag } from '@/validation/types'
+import { Violation } from '@/validation/validator'
 
 @Component({ name: 'FormularioForm' })
 export default class FormularioForm extends Vue {
@@ -41,13 +34,22 @@ export default class FormularioForm extends Vue {
 
     public proxy: Record<string, any> = {}
 
-    registry: Registry = new Registry(this)
+    private registry: Registry = new Registry(this)
 
     private errorObserverRegistry = new ErrorObserverRegistry()
     // Local error messages are temporal, they wiped each resetValidation call
     private localFormErrors: string[] = []
     private localFieldErrors: Record<string, string[]> = {}
 
+    get initialValues (): Record<string, any> {
+        if (this.hasModel && typeof this.formularioValue === 'object') {
+            // If there is a v-model on the form/group, use those values as first priority
+            return { ...this.formularioValue } // @todo - use a deep clone to detach reference types
+        }
+
+        return {}
+    }
+
     get mergedFormErrors (): string[] {
         return [...this.formErrors, ...this.localFormErrors]
     }
@@ -64,15 +66,6 @@ export default class FormularioForm extends Vue {
         return this.formularioValue && typeof this.formularioValue === 'object'
     }
 
-    get initialValues (): Record<string, any> {
-        if (this.hasModel && typeof this.formularioValue === 'object') {
-            // If there is a v-model on the form/group, use those values as first priority
-            return { ...this.formularioValue } // @todo - use a deep clone to detach reference types
-        }
-
-        return {}
-    }
-
     @Watch('formularioValue', { deep: true })
     onFormularioValueChanged (values: Record<string, any>): void {
         if (this.hasModel && values && typeof values === 'object') {
@@ -101,7 +94,7 @@ export default class FormularioForm extends Vue {
 
     onFormSubmit (): Promise<void> {
         return this.hasValidationErrors()
-            .then(hasErrors => hasErrors ? undefined : cloneDeep(this.proxy))
+            .then(hasErrors => hasErrors ? undefined : clone(this.proxy))
             .then(data => {
                 if (typeof data !== 'undefined') {
                     this.$emit('submit', data)
@@ -112,8 +105,8 @@ export default class FormularioForm extends Vue {
     }
 
     @Provide()
-    onFormularioFieldValidation (errorBag: ValidationErrorBag): void {
-        this.$emit('validation', errorBag)
+    onFormularioFieldValidation (payload: { name: string; violations: Violation[]}): void {
+        this.$emit('validation', payload)
     }
 
     @Provide()
@@ -193,19 +186,18 @@ export default class FormularioForm extends Vue {
         }
     }
 
-    hasValidationErrors (): Promise<boolean> {
-        return Promise.all(this.registry.reduce((resolvers: Promise<boolean>[], input: FormularioInput) => {
-            resolvers.push(input.performValidation() && input.hasValidationErrors())
-            return resolvers
-        }, [])).then(results => results.some(hasErrors => hasErrors))
-    }
-
     setErrors ({ formErrors, inputErrors }: { formErrors?: string[]; inputErrors?: Record<string, string[]> }): void {
-        // given an object of errors, apply them to this form
         this.localFormErrors = formErrors || []
         this.localFieldErrors = inputErrors || {}
     }
 
+    hasValidationErrors (): Promise<boolean> {
+        return Promise.all(this.registry.reduce((resolvers: Promise<boolean>[], input: FormularioInput) => {
+            resolvers.push(input.runValidation() && input.hasValidationErrors())
+            return resolvers
+        }, [])).then(results => results.some(hasErrors => hasErrors))
+    }
+
     resetValidation (): void {
         this.localFormErrors = []
         this.localFieldErrors = {}
diff --git a/src/FormularioInput.vue b/src/FormularioInput.vue
index 4f09160..c2247a3 100644
--- a/src/FormularioInput.vue
+++ b/src/FormularioInput.vue
@@ -1,10 +1,6 @@
 <template>
     <div class="formulario-input">
-        <slot
-            :id="id"
-            :context="context"
-            :violations="validationErrors"
-        />
+        <slot :context="context" />
     </div>
 </template>
 
@@ -17,21 +13,17 @@ import {
     Prop,
     Watch,
 } from 'vue-property-decorator'
-import { arrayify, has, parseRules, shallowEqualObjects, snakeToCamel } from './libs/utils'
+import { arrayify, has, shallowEqualObjects, snakeToCamel } from './utils'
 import {
-    ValidationContext,
-    ValidationError,
-    ValidationRule,
-} from '@/validation/types'
-import {
-    createValidatorGroups,
+    CheckRuleFn,
+    CreateMessageFn,
+    processConstraints,
     validate,
-    Validator,
-    ValidatorGroup,
+    Violation,
 } from '@/validation/validator'
 
-const ERROR_BEHAVIOR = {
-    BLUR: 'blur',
+const VALIDATION_BEHAVIOR = {
+    DEMAND: 'demand',
     LIVE: 'live',
     SUBMIT: 'submit',
 }
@@ -47,53 +39,78 @@ export default class FormularioInput extends Vue {
     @Inject({ default: undefined }) removeErrorObserver!: Function|undefined
     @Inject({ default: '' }) path!: string
 
-    @Model('input', { default: '' }) formularioValue: any
+    @Model('input', { default: '' }) value!: any
 
-    @Prop({ default: null }) id!: string|number|null
-    @Prop({ required: true }) name!: string
-    @Prop({ default: false }) value!: any
-    @Prop({ default: '' }) validation!: string|any[]
-    @Prop({ default: () => ({}) }) validationRules!: Record<string, ValidationRule>
-    @Prop({ default: () => ({}) }) validationMessages!: Record<string, any>
-    @Prop({ default: () => [] }) errors!: string[]
     @Prop({
-        default: ERROR_BEHAVIOR.BLUR,
-        validator: behavior => [ERROR_BEHAVIOR.BLUR, ERROR_BEHAVIOR.LIVE, ERROR_BEHAVIOR.SUBMIT].includes(behavior)
-    }) errorBehavior!: string
+        required: true,
+        validator: (name: any): boolean => typeof name === 'string' && name.length > 0,
+    }) name!: string
 
-    @Prop({ default: false }) disableErrors!: boolean
+    @Prop({ default: '' }) validation!: string|any[]
+    @Prop({ default: () => ({}) }) validationRules!: Record<string, CheckRuleFn>
+    @Prop({ default: () => ({}) }) validationMessages!: Record<string, CreateMessageFn|string>
+    @Prop({
+        default: VALIDATION_BEHAVIOR.DEMAND,
+        validator: behavior => Object.values(VALIDATION_BEHAVIOR).includes(behavior)
+    }) validationBehavior!: string
 
-    defaultId: string = this.$formulario.nextId(this)
-    proxy: Record<string, any> = this.getInitialValue()
-    localErrors: string[] = []
-    validationErrors: ValidationError[] = []
-    pendingValidation: Promise<any> = Promise.resolve()
+    // Affects only observing & setting of local errors
+    @Prop({ default: false }) errorsDisabled!: boolean
+
+    public proxy: any = this.getInitialValue()
+
+    private localErrors: string[] = []
+    private violations: Violation[] = []
+    private validationRun: Promise<any> = Promise.resolve()
+
+    get fullQualifiedName (): string {
+        return this.path !== '' ? `${this.path}.${this.name}` : this.name
+    }
+
+    get model (): any {
+        const model = this.hasModel ? 'value' : 'proxy'
+        if (this[model] === undefined) {
+            return ''
+        }
+        return this[model]
+    }
+
+    set model (value: any) {
+        if (!shallowEqualObjects(value, this.proxy)) {
+            this.proxy = value
+        }
+
+        this.$emit('input', value)
+
+        if (typeof this.formularioSetter === 'function') {
+            this.formularioSetter(this.context.name, value)
+        }
+    }
 
     get context (): Record<string, any> {
         return Object.defineProperty({
-            id: this.id || this.defaultId,
-            name: this.nameOrFallback,
-            blurHandler: this.blurHandler.bind(this),
-            errors: this.explicitErrors,
-            allErrors: this.allErrors,
-            performValidation: this.performValidation.bind(this),
-            validationErrors: this.validationErrors,
-            value: this.value,
+            name: this.fullQualifiedName,
+            runValidation: this.runValidation.bind(this),
+            violations: this.violations,
+            errors: this.localErrors,
+            allErrors: [...this.localErrors, ...this.violations.map(v => v.message)],
         }, 'model', {
-            get: this.modelGetter.bind(this),
-            set: this.modelSetter.bind(this),
+            get: () => this.model,
+            set: (value: any) => {
+                this.model = value
+            },
         })
     }
 
-    get parsedValidationRules (): Record<string, ValidationRule> {
-        const parsedValidationRules: Record<string, ValidationRule> = {}
+    get normalizedValidationRules (): Record<string, CheckRuleFn> {
+        const rules: Record<string, CheckRuleFn> = {}
         Object.keys(this.validationRules).forEach(key => {
-            parsedValidationRules[snakeToCamel(key)] = this.validationRules[key]
+            rules[snakeToCamel(key)] = this.validationRules[key]
         })
-        return parsedValidationRules
+        return rules
     }
 
-    get messages (): Record<string, any> {
+    get normalizedValidationMessages (): Record<string, any> {
         const messages: Record<string, any> = {}
         Object.keys(this.validationMessages).forEach((key) => {
             messages[snakeToCamel(key)] = this.validationMessages[key]
@@ -101,131 +118,60 @@ export default class FormularioInput extends Vue {
         return messages
     }
 
-    /**
-     * Return the element’s name, or select a fallback.
-     */
-    get nameOrFallback (): string {
-        return this.path !== '' ? `${this.path}.${this.name}` : this.name
-    }
-
-    /**
-     * Does this computed property have errors
-     */
-    get hasErrors (): boolean {
-        return this.allErrors.length > 0
-    }
-
-    /**
-     * The merged errors computed property.
-     * Each error is an object with fields message (translated message), rule (rule name) and context
-     */
-    get allErrors (): ValidationError[] {
-        return [
-            ...this.explicitErrors.map(message => ({ message })),
-            ...arrayify(this.validationErrors)
-        ]
-    }
-
-    /**
-     * These are errors we that have been explicitly passed to us.
-     */
-    get explicitErrors (): string[] {
-        return [...arrayify(this.errors), ...this.localErrors]
-    }
-
     /**
      * Determines if this formulario element is v-modeled or not.
      */
     get hasModel (): boolean {
-        return has(this.$options.propsData || {}, 'formularioValue')
+        return has(this.$options.propsData || {}, 'value')
     }
 
     @Watch('proxy')
-    onProxyChanged (newValue: Record<string, any>, oldValue: Record<string, any>): void {
-        if (this.errorBehavior === ERROR_BEHAVIOR.LIVE) {
-            this.performValidation()
-        } else {
-            this.validationErrors = []
-        }
+    onProxyChanged (newValue: any, oldValue: any): void {
         if (!this.hasModel && !shallowEqualObjects(newValue, oldValue)) {
             this.context.model = newValue
         }
+        if (this.validationBehavior === VALIDATION_BEHAVIOR.LIVE) {
+            this.runValidation()
+        } else {
+            this.violations = []
+        }
     }
 
-    @Watch('formularioValue')
-    onFormularioValueChanged (newValue: Record<string, any>, oldValue: Record<string, any>): void {
+    @Watch('value')
+    onValueChanged (newValue: any, oldValue: any): void {
         if (this.hasModel && !shallowEqualObjects(newValue, oldValue)) {
             this.context.model = newValue
         }
     }
 
     created (): void {
-        this.applyInitialValue()
-        if (this.formularioRegister && typeof this.formularioRegister === 'function') {
-            this.formularioRegister(this.nameOrFallback, this)
+        this.initProxy()
+        if (typeof this.formularioRegister === 'function') {
+            this.formularioRegister(this.fullQualifiedName, this)
         }
-        if (!this.disableErrors && typeof this.addErrorObserver === 'function') {
-            this.addErrorObserver({ callback: this.setErrors, type: 'input', field: this.nameOrFallback })
+        if (typeof this.addErrorObserver === 'function' && !this.errorsDisabled) {
+            this.addErrorObserver({ callback: this.setErrors, type: 'input', field: this.fullQualifiedName })
         }
-        if (this.errorBehavior === ERROR_BEHAVIOR.LIVE) {
-            this.performValidation()
+        if (this.validationBehavior === VALIDATION_BEHAVIOR.LIVE) {
+            this.runValidation()
         }
     }
 
     // noinspection JSUnusedGlobalSymbols
     beforeDestroy (): void {
-        if (!this.disableErrors && typeof this.removeErrorObserver === 'function') {
+        if (!this.errorsDisabled && typeof this.removeErrorObserver === 'function') {
             this.removeErrorObserver(this.setErrors)
         }
         if (typeof this.formularioDeregister === 'function') {
-            this.formularioDeregister(this.nameOrFallback)
-        }
-    }
-
-    /**
-     * Get the value from a model.
-     */
-    modelGetter (): any {
-        const model = this.hasModel ? 'formularioValue' : 'proxy'
-        if (this[model] === undefined) {
-            return ''
-        }
-        return this[model]
-    }
-
-    /**
-     * Set the value from a model.
-     */
-    modelSetter (value: any): void {
-        if (!shallowEqualObjects(value, this.proxy)) {
-            this.proxy = value
-        }
-        this.$emit('input', value)
-        if (this.context.name && typeof this.formularioSetter === 'function') {
-            this.formularioSetter(this.context.name, value)
-        }
-    }
-
-    /**
-     * Bound into the context object.
-     */
-    blurHandler (): void {
-        this.$emit('blur')
-        if (this.errorBehavior === ERROR_BEHAVIOR.BLUR) {
-            this.performValidation()
+            this.formularioDeregister(this.fullQualifiedName)
         }
     }
 
     getInitialValue (): any {
-        if (has(this.$options.propsData as Record<string, any>, 'value')) {
-            return this.value
-        } else if (has(this.$options.propsData as Record<string, any>, 'formularioValue')) {
-            return this.formularioValue
-        }
-        return ''
+        return has(this.$options.propsData || {}, 'value') ? this.value : ''
     }
 
-    applyInitialValue (): void {
+    initProxy (): void {
         // This should only be run immediately on created and ensures that the
         // proxy and the model are both the same before any additional registration.
         if (!shallowEqualObjects(this.context.model, this.proxy)) {
@@ -233,98 +179,42 @@ export default class FormularioInput extends Vue {
         }
     }
 
-    performValidation (): Promise<void> {
-        this.pendingValidation = this.validate().then(errors => {
-            this.didValidate(errors)
-        })
-        return this.pendingValidation
-    }
-
-    applyValidator (validator: Validator): Promise<ValidationError|false> {
-        return validate(validator, {
-            value: this.context.model,
-            name: this.context.name,
-            getFormValues: this.getFormValues.bind(this),
-        }).then(valid => valid ? false : this.getMessageObject(validator.name, validator.args))
-    }
-
-    applyValidatorGroup (group: ValidatorGroup): Promise<ValidationError[]> {
-        return Promise.all(group.validators.map(this.applyValidator))
-            .then(violations => (violations.filter(v => v !== false) as ValidationError[]))
-    }
-
-    validate (): Promise<ValidationError[]> {
-        return new Promise(resolve => {
-            const resolveGroups = (groups: ValidatorGroup[], all: ValidationError[] = []): void => {
-                if (groups.length) {
-                    const current = groups.shift() as ValidatorGroup
-
-                    this.applyValidatorGroup(current).then(violations => {
-                        // The rule passed or its a non-bailing group, and there are additional groups to check, continue
-                        if ((violations.length === 0 || !current.bail) && groups.length) {
-                            return resolveGroups(groups, all.concat(violations))
-                        }
-                        return resolve(all.concat(violations))
-                    })
-                } else {
-                    resolve([])
+    runValidation (): Promise<void> {
+        this.validationRun = this.validate().then(violations => {
+            const validationChanged = !shallowEqualObjects(violations, this.violations)
+            this.violations = violations
+            if (validationChanged) {
+                const payload = {
+                    name: this.context.name,
+                    violations: this.violations,
+                }
+                this.$emit('validation', payload)
+                if (typeof this.onFormularioFieldValidation === 'function') {
+                    this.onFormularioFieldValidation(payload)
                 }
             }
-            resolveGroups(createValidatorGroups(
-                parseRules(this.validation, this.$formulario.rules(this.parsedValidationRules))
-            ))
+
+            return this.violations
         })
+        return this.validationRun
     }
 
-    didValidate (violations: ValidationError[]): void {
-        const validationChanged = !shallowEqualObjects(violations, this.validationErrors)
-        this.validationErrors = violations
-        if (validationChanged) {
-            const errorBag = {
-                name: this.context.name,
-                errors: this.validationErrors,
-            }
-            this.$emit('validation', errorBag)
-            if (this.onFormularioFieldValidation && typeof this.onFormularioFieldValidation === 'function') {
-                this.onFormularioFieldValidation(errorBag)
-            }
-        }
-    }
-
-    getMessageObject (ruleName: string | undefined, args: any[]): ValidationError {
-        const context = {
-            args,
-            name: this.name,
+    validate (): Promise<Violation[]> {
+        return validate(processConstraints(
+            this.validation,
+            this.$formulario.getRules(this.normalizedValidationRules),
+            this.$formulario.getMessages(this, this.normalizedValidationMessages),
+        ), {
             value: this.context.model,
+            name: this.context.name,
             formValues: this.getFormValues(),
-        }
-        const message = this.getMessageFunc(ruleName || '')(context)
-
-        return {
-            rule: ruleName,
-            context,
-            message,
-        }
-    }
-
-    getMessageFunc (ruleName: string): Function {
-        ruleName = snakeToCamel(ruleName)
-        if (this.messages && typeof this.messages[ruleName] !== 'undefined') {
-            switch (typeof this.messages[ruleName]) {
-                case 'function':
-                    return this.messages[ruleName]
-                case 'string':
-                case 'boolean':
-                    return (): string => this.messages[ruleName]
-            }
-        }
-        return (context: ValidationContext): string => this.$formulario.validationMessage(ruleName, context, this)
+        })
     }
 
     hasValidationErrors (): Promise<boolean> {
         return new Promise(resolve => {
             this.$nextTick(() => {
-                this.pendingValidation.then(() => resolve(!!this.validationErrors.length))
+                this.validationRun.then(() => resolve(this.violations.length > 0))
             })
         })
     }
@@ -335,7 +225,7 @@ export default class FormularioInput extends Vue {
 
     resetValidation (): void {
         this.localErrors = []
-        this.validationErrors = []
+        this.violations = []
     }
 }
 </script>
diff --git a/src/form/registry.ts b/src/form/registry.ts
index c79e7dd..1cddf71 100644
--- a/src/form/registry.ts
+++ b/src/form/registry.ts
@@ -1,4 +1,4 @@
-import { shallowEqualObjects, has, getNested } from '@/libs/utils'
+import { shallowEqualObjects, has, getNested } from '@/utils'
 import FormularioForm from '@/FormularioForm.vue'
 import FormularioInput from '@/FormularioInput.vue'
 
@@ -80,15 +80,6 @@ export default class Registry {
         return result
     }
 
-    /**
-     * Map over the registry (recursively).
-     */
-    map (mapper: Function): Record<string, any> {
-        const value = {}
-        this.registry.forEach((component, field) => Object.assign(value, { [field]: mapper(component, field) }))
-        return value
-    }
-
     /**
      * Map over the registry (recursively).
      */
@@ -115,8 +106,7 @@ export default class Registry {
             return
         }
         this.registry.set(field, component)
-        const hasModel = has(component.$options.propsData || {}, 'formularioValue')
-        const hasValue = has(component.$options.propsData || {}, 'value')
+        const hasModel = has(component.$options.propsData || {}, 'value')
         if (
             !hasModel &&
             // @ts-ignore
@@ -129,7 +119,7 @@ export default class Registry {
             // @ts-ignore
             component.context.model = getNested(this.ctx.initialValues, field)
         } else if (
-            (hasModel || hasValue) &&
+            hasModel &&
             // @ts-ignore
             !shallowEqualObjects(component.proxy, getNested(this.ctx.initialValues, field))
         ) {
@@ -138,11 +128,6 @@ export default class Registry {
             // @ts-ignore
             this.ctx.setFieldValue(field, component.proxy)
         }
-        // @ts-ignore
-        if (this.ctx.childrenShouldShowErrors) {
-            // @ts-ignore
-            component.formShouldShowErrors = true
-        }
     }
 
     /**
diff --git a/src/libs/utils.ts b/src/libs/utils.ts
deleted file mode 100644
index 4f706d1..0000000
--- a/src/libs/utils.ts
+++ /dev/null
@@ -1,279 +0,0 @@
-export function shallowEqualObjects (objA: Record<string, any>, objB: Record<string, any>): boolean {
-    if (objA === objB) {
-        return true
-    }
-
-    if (!objA || !objB) {
-        return false
-    }
-
-    const aKeys = Object.keys(objA)
-    const bKeys = Object.keys(objB)
-
-    if (bKeys.length !== aKeys.length) {
-        return false
-    }
-
-    if (objA instanceof Date && objB instanceof Date) {
-        return objA.getTime() === objB.getTime()
-    }
-
-    if (aKeys.length === 0) {
-        return objA === objB
-    }
-
-    for (let i = 0; i < aKeys.length; i++) {
-        const key = aKeys[i]
-
-        if (objA[key] !== objB[key]) {
-            return false
-        }
-    }
-    return true
-}
-
-/**
- * Given a string, convert snake_case to camelCase
- * @param {String} string
- */
-export function snakeToCamel (string: string | any): string | any {
-    if (typeof string === 'string') {
-        return string.replace(/([_][a-z0-9])/ig, ($1) => {
-            if (string.indexOf($1) !== 0 && string[string.indexOf($1) - 1] !== '_') {
-                return $1.toUpperCase().replace('_', '')
-            }
-            return $1
-        })
-    }
-    return string
-}
-
-/**
- * Return the rule name with the applicable modifier as an array.
- */
-function parseModifier (ruleName: any): [string|any, string|null] {
-    if (typeof ruleName === 'string' && /^[\^]/.test(ruleName.charAt(0))) {
-        return [snakeToCamel(ruleName.substr(1)), ruleName.charAt(0)]
-    }
-    return [snakeToCamel(ruleName), null]
-}
-
-/**
- * Converts to array.
- * If given parameter is not string, object ot array, result will be an empty array.
- * @param {*} item
- */
-export function arrayify (item: any): any[] {
-    if (!item) {
-        return []
-    }
-    if (typeof item === 'string') {
-        return [item]
-    }
-    if (Array.isArray(item)) {
-        return item
-    }
-    if (typeof item === 'object') {
-        return Object.values(item)
-    }
-    return []
-}
-
-/**
- * Given a string or function, parse it and return an array in the format
- * [fn, [...arguments]]
- */
-function parseRule (rule: any, rules: Record<string, any>) {
-    if (typeof rule === 'function') {
-        return [rule, []]
-    }
-
-    if (Array.isArray(rule) && rule.length) {
-        rule = rule.slice() // light clone
-        const [ruleName, modifier] = parseModifier(rule.shift())
-        if (typeof ruleName === 'string' && Object.prototype.hasOwnProperty.call(rules, ruleName)) {
-            return [rules[ruleName], rule, ruleName, modifier]
-        }
-        if (typeof ruleName === 'function') {
-            return [ruleName, rule, ruleName, modifier]
-        }
-    }
-
-    if (typeof rule === 'string') {
-        const segments = rule.split(':')
-        const [ruleName, modifier] = parseModifier(segments.shift())
-
-        if (Object.prototype.hasOwnProperty.call(rules, ruleName)) {
-            return [rules[ruleName], segments.length ? segments.join(':').split(',') : [], ruleName, modifier]
-        } else {
-            throw new Error(`Unknown validation rule ${rule}`)
-        }
-    }
-
-    return false
-}
-
-/**
- * Given an array or string return an array of callables.
- * @param {array|string} validation
- * @param {array} rules and array of functions
- * @return {array} an array of functions
- */
-export function parseRules (validation: any[]|string, rules: any): any[] {
-    if (typeof validation === 'string') {
-        return parseRules(validation.split('|').filter(f => f.length), rules)
-    }
-    if (!Array.isArray(validation)) {
-        return []
-    }
-    return validation.map(rule => {
-        return parseRule(rule, rules)
-    }).filter(f => !!f)
-}
-
-/**
- * Escape a string for use in regular expressions.
- */
-export function escapeRegExp (string: string): string {
-    return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&') // $& means the whole matched string
-}
-
-/**
- * Given a string format (date) return a regex to match against.
- */
-export function regexForFormat (format: string): RegExp {
-    const escaped = `^${escapeRegExp(format)}$`
-    const formats: Record<string, string> = {
-        MM: '(0[1-9]|1[012])',
-        M: '([1-9]|1[012])',
-        DD: '([012][1-9]|3[01])',
-        D: '([012]?[1-9]|3[01])',
-        YYYY: '\\d{4}',
-        YY: '\\d{2}'
-    }
-
-    return new RegExp(Object.keys(formats).reduce((regex, format) => {
-        return regex.replace(format, formats[format])
-    }, escaped))
-}
-
-/**
- * Check if
- * @param {*} data
- */
-export function isScalar (data: any): boolean {
-    switch (typeof data) {
-        case 'symbol':
-        case 'number':
-        case 'string':
-        case 'boolean':
-        case 'undefined':
-            return true
-        default:
-            return data === null
-    }
-}
-
-/**
- * A simple (somewhat non-comprehensive) cloneDeep function, valid for our use
- * case of needing to unbind reactive watchers.
- */
-export function cloneDeep (value: any): any {
-    if (typeof value !== 'object') {
-        return value
-    }
-
-    const copy: any | Record<string, any> = Array.isArray(value) ? [] : {}
-
-    for (const key in value) {
-        if (Object.prototype.hasOwnProperty.call(value, key)) {
-            if (isScalar(value[key])) {
-                copy[key] = value[key]
-            } else {
-                copy[key] = cloneDeep(value[key])
-            }
-        }
-    }
-
-    return copy
-}
-
-/**
- * Given a locale string, parse the options.
- * @param {string} locale
- */
-export function parseLocale (locale: string): string[] {
-    const segments = locale.split('-')
-    return segments.reduce((options: string[], segment: string) => {
-        if (options.length) {
-            options.unshift(`${options[0]}-${segment}`)
-        }
-        return options.length ? options : [segment]
-    }, [])
-}
-
-/**
- * Shorthand for Object.prototype.hasOwnProperty.call (space saving)
- */
-export function has (ctx: Record<string, any>, prop: string): boolean {
-    return Object.prototype.hasOwnProperty.call(ctx, prop)
-}
-
-export function getNested (obj: Record<string, any>, field: string): any {
-    const fieldParts = field.split('.')
-
-    let result: Record<string, any> = obj
-
-    for (const key in fieldParts) {
-        const matches = fieldParts[key].match(/(.+)\[(\d+)\]$/)
-        if (result === undefined) {
-            return null
-        }
-        if (matches) {
-            result = result[matches[1]]
-
-            if (result === undefined) {
-                return null
-            }
-            result = result[matches[2]]
-        } else {
-            result = result[fieldParts[key]]
-        }
-    }
-    return result
-}
-
-export function setNested (obj: Record<string, any>, field: string, value: any): void {
-    const fieldParts = field.split('.')
-
-    let subProxy: Record<string, any> = obj
-    for (let i = 0; i < fieldParts.length; i++) {
-        const fieldPart = fieldParts[i]
-        const matches = fieldPart.match(/(.+)\[(\d+)\]$/)
-
-        if (matches) {
-            if (subProxy[matches[1]] === undefined) {
-                subProxy[matches[1]] = []
-            }
-            subProxy = subProxy[matches[1]]
-
-            if (i === fieldParts.length - 1) {
-                subProxy[matches[2]] = value
-                break
-            } else {
-                subProxy = subProxy[matches[2]]
-            }
-        } else {
-            if (i === fieldParts.length - 1) {
-                subProxy[fieldPart] = value
-                break
-            } else {
-                // eslint-disable-next-line max-depth
-                if (subProxy[fieldPart] === undefined) {
-                    subProxy[fieldPart] = {}
-                }
-                subProxy = subProxy[fieldPart]
-            }
-        }
-    }
-}
diff --git a/src/shims-ext.d.ts b/src/shims-ext.d.ts
index 8eeb681..0bf492e 100644
--- a/src/shims-ext.d.ts
+++ b/src/shims-ext.d.ts
@@ -11,10 +11,4 @@ declare module 'vue/types/vue' {
     interface VueRoute {
         path: string;
     }
-
-    interface FormularioForm extends Vue {
-        name: string | boolean;
-        proxy: Record<string, any>;
-        hasValidationErrors(): Promise<boolean>;
-    }
 }
diff --git a/src/utils/arrayify.ts b/src/utils/arrayify.ts
new file mode 100644
index 0000000..94eee43
--- /dev/null
+++ b/src/utils/arrayify.ts
@@ -0,0 +1,20 @@
+/**
+ * Converts to array.
+ * If given parameter is not string, object ot array, result will be an empty array.
+ * @param {*} item
+ */
+export default function arrayify (item: any): any[] {
+    if (!item) {
+        return []
+    }
+    if (typeof item === 'string') {
+        return [item]
+    }
+    if (Array.isArray(item)) {
+        return item
+    }
+    if (typeof item === 'object') {
+        return Object.values(item)
+    }
+    return []
+}
diff --git a/src/utils/clone.ts b/src/utils/clone.ts
new file mode 100644
index 0000000..0492ace
--- /dev/null
+++ b/src/utils/clone.ts
@@ -0,0 +1,22 @@
+import isScalar from '@/utils/isScalar'
+import has from '@/utils/has'
+
+/**
+ * A simple (somewhat non-comprehensive) clone function, valid for our use
+ * case of needing to unbind reactive watchers.
+ */
+export default function clone (value: any): any {
+    if (typeof value !== 'object') {
+        return value
+    }
+
+    const copy: any | Record<string, any> = Array.isArray(value) ? [] : {}
+
+    for (const key in value) {
+        if (has(value, key)) {
+            copy[key] = isScalar(value[key]) ? value[key] : clone(value[key])
+        }
+    }
+
+    return copy
+}
diff --git a/src/utils/has.ts b/src/utils/has.ts
new file mode 100644
index 0000000..247480c
--- /dev/null
+++ b/src/utils/has.ts
@@ -0,0 +1,6 @@
+/**
+ * Shorthand for Object.prototype.hasOwnProperty.call (space saving)
+ */
+export default function has (ctx: Record<string, any>|any[], prop: string|number): boolean {
+    return Object.prototype.hasOwnProperty.call(ctx, prop)
+}
diff --git a/src/utils/index.ts b/src/utils/index.ts
new file mode 100644
index 0000000..0c36005
--- /dev/null
+++ b/src/utils/index.ts
@@ -0,0 +1,67 @@
+export { default as arrayify } from './arrayify'
+export { default as clone } from './clone'
+export { default as has } from './has'
+export { default as isScalar } from './isScalar'
+export { default as merge } from './merge'
+export { default as regexForFormat } from './regexForFormat'
+export { default as shallowEqualObjects } from './shallowEqualObjects'
+export { default as snakeToCamel } from './snakeToCamel'
+
+export function getNested (obj: Record<string, any>, field: string): any {
+    const fieldParts = field.split('.')
+
+    let result: Record<string, any> = obj
+
+    for (const key in fieldParts) {
+        const matches = fieldParts[key].match(/(.+)\[(\d+)\]$/)
+        if (result === undefined) {
+            return null
+        }
+        if (matches) {
+            result = result[matches[1]]
+
+            if (result === undefined) {
+                return null
+            }
+            result = result[matches[2]]
+        } else {
+            result = result[fieldParts[key]]
+        }
+    }
+    return result
+}
+
+export function setNested (obj: Record<string, any>, field: string, value: any): void {
+    const fieldParts = field.split('.')
+
+    let subProxy: Record<string, any> = obj
+    for (let i = 0; i < fieldParts.length; i++) {
+        const fieldPart = fieldParts[i]
+        const matches = fieldPart.match(/(.+)\[(\d+)\]$/)
+
+        if (matches) {
+            if (subProxy[matches[1]] === undefined) {
+                subProxy[matches[1]] = []
+            }
+            subProxy = subProxy[matches[1]]
+
+            if (i === fieldParts.length - 1) {
+                subProxy[matches[2]] = value
+                break
+            } else {
+                subProxy = subProxy[matches[2]]
+            }
+        } else {
+            if (i === fieldParts.length - 1) {
+                subProxy[fieldPart] = value
+                break
+            } else {
+                // eslint-disable-next-line max-depth
+                if (subProxy[fieldPart] === undefined) {
+                    subProxy[fieldPart] = {}
+                }
+                subProxy = subProxy[fieldPart]
+            }
+        }
+    }
+}
diff --git a/src/utils/isScalar.ts b/src/utils/isScalar.ts
new file mode 100644
index 0000000..572b0c5
--- /dev/null
+++ b/src/utils/isScalar.ts
@@ -0,0 +1,12 @@
+export default function isScalar (data: any): boolean {
+    switch (typeof data) {
+        case 'symbol':
+        case 'number':
+        case 'string':
+        case 'boolean':
+        case 'undefined':
+            return true
+        default:
+            return data === null
+    }
+}
diff --git a/src/utils/merge.ts b/src/utils/merge.ts
index 02d3c05..e6d673c 100644
--- a/src/utils/merge.ts
+++ b/src/utils/merge.ts
@@ -1,5 +1,5 @@
 import isPlainObject from 'is-plain-object'
-import { has } from '@/libs/utils.ts'
+import has from '@/utils/has.ts'
 
 /**
  * Create a new object by copying properties of base and mergeWith.
diff --git a/src/utils/regexForFormat.ts b/src/utils/regexForFormat.ts
new file mode 100644
index 0000000..9830754
--- /dev/null
+++ b/src/utils/regexForFormat.ts
@@ -0,0 +1,25 @@
+/**
+ * Escape a string for use in regular expressions.
+ */
+function escapeRegExp (string: string): string {
+    return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&') // $& means the whole matched string
+}
+
+/**
+ * Given a string format (date) return a regex to match against.
+ */
+export default function regexForFormat (format: string): RegExp {
+    const escaped = `^${escapeRegExp(format)}$`
+    const formats: Record<string, string> = {
+        MM: '(0[1-9]|1[012])',
+        M: '([1-9]|1[012])',
+        DD: '([012][1-9]|3[01])',
+        D: '([012]?[1-9]|3[01])',
+        YYYY: '\\d{4}',
+        YY: '\\d{2}'
+    }
+
+    return new RegExp(Object.keys(formats).reduce((regex, format) => {
+        return regex.replace(format, formats[format])
+    }, escaped))
+}
diff --git a/src/utils/shallowEqualObjects.ts b/src/utils/shallowEqualObjects.ts
new file mode 100644
index 0000000..6f4a207
--- /dev/null
+++ b/src/utils/shallowEqualObjects.ts
@@ -0,0 +1,34 @@
+export default function shallowEqualObjects (objA: Record<string, any>, objB: Record<string, any>): boolean {
+    if (objA === objB) {
+        return true
+    }
+
+    if (!objA || !objB) {
+        return false
+    }
+
+    const aKeys = Object.keys(objA)
+    const bKeys = Object.keys(objB)
+
+    if (bKeys.length !== aKeys.length) {
+        return false
+    }
+
+    if (objA instanceof Date && objB instanceof Date) {
+        return objA.getTime() === objB.getTime()
+    }
+
+    if (aKeys.length === 0) {
+        return objA === objB
+    }
+
+    for (let i = 0; i < aKeys.length; i++) {
+        const key = aKeys[i]
+
+        if (objA[key] !== objB[key]) {
+            return false
+        }
+    }
+
+    return true
+}
diff --git a/src/utils/snakeToCamel.ts b/src/utils/snakeToCamel.ts
new file mode 100644
index 0000000..77335cb
--- /dev/null
+++ b/src/utils/snakeToCamel.ts
@@ -0,0 +1,11 @@
+/**
+ * Given a string, convert snake_case to camelCase
+ */
+export default function snakeToCamel (string: string): string {
+    return string.replace(/([_][a-z0-9])/ig, ($1) => {
+        if (string.indexOf($1) !== 0 && string[string.indexOf($1) - 1] !== '_') {
+            return $1.toUpperCase().replace('_', '')
+        }
+        return $1
+    })
+}
diff --git a/src/validation/ErrorObserver.ts b/src/validation/ErrorObserver.ts
index ed5bf5b..250536f 100644
--- a/src/validation/ErrorObserver.ts
+++ b/src/validation/ErrorObserver.ts
@@ -1,4 +1,4 @@
-import { has } from '@/libs/utils'
+import { has } from '@/utils'
 
 export interface ErrorHandler {
     (errors: Record<string, any> | any[]): void;
diff --git a/src/validation/messages.ts b/src/validation/messages.ts
index 29b6f90..902aea1 100644
--- a/src/validation/messages.ts
+++ b/src/validation/messages.ts
@@ -1,19 +1,5 @@
-import { ValidationContext } from '@/validation/types'
+import { ValidationContext } from '@/validation/validator'
 
-/**
- * This is an object of functions that each produce valid responses. There's no
- * need for these to be 1-1 with english, feel free to change the wording or
- * use/not use any of the variables available in the object or the
- * arguments for the message to make the most sense in your language and culture.
- *
- * The validation context object includes the following properties:
- * {
- *   args        // Array of rule arguments: between:5,10 (args are ['5', '10'])
- *   name:       // The validation name to be used
- *   value:      // The value of the field (do not mutate!),
- *   formValues: // If wrapped in a FormulateForm, the value of other form fields.
- * }
- */
 export default {
     /**
      * The default render method for error messages.
@@ -32,8 +18,8 @@ export default {
     /**
      * The date is not after.
      */
-    after (vm: Vue, context: ValidationContext): string {
-        if (Array.isArray(context.args) && context.args.length) {
+    after (vm: Vue, context: ValidationContext, compare: string | false = false): string {
+        if (typeof compare === 'string' && compare.length) {
             return vm.$t('validation.after.compare', context)
         }
 
@@ -50,15 +36,15 @@ export default {
     /**
      * Rule: checks if the value is alpha numeric
      */
-    alphanumeric (vm: Vue, context: Record<string, any>): string {
+    alphanumeric (vm: Vue, context: ValidationContext): string {
         return vm.$t('validation.alphanumeric', context)
     },
 
     /**
      * The date is not before.
      */
-    before (vm: Vue, context: ValidationContext): string {
-        if (Array.isArray(context.args) && context.args.length) {
+    before (vm: Vue, context: ValidationContext, compare: string|false = false): string {
+        if (typeof compare === 'string' && compare.length) {
             return vm.$t('validation.before.compare', context)
         }
 
@@ -68,14 +54,14 @@ export default {
     /**
      * The value is not between two numbers or lengths
      */
-    between (vm: Vue, context: ValidationContext): string {
-        const force = Array.isArray(context.args) && context.args[2] ? context.args[2] : false
+    between (vm: Vue, context: ValidationContext, from: number|any = 0, to: number|any = 10, force?: string): string {
+        const data = { ...context, from, to }
 
         if ((!isNaN(context.value) && force !== 'length') || force === 'value') {
-            return vm.$t('validation.between.force', context)
+            return vm.$t('validation.between.force', data)
         }
 
-        return vm.$t('validation.between.default', context)
+        return vm.$t('validation.between.default', data)
     },
 
     /**
@@ -88,8 +74,8 @@ export default {
     /**
      * Is not a valid date.
      */
-    date (vm: Vue, context: ValidationContext): string {
-        if (Array.isArray(context.args) && context.args.length) {
+    date (vm: Vue, context: ValidationContext, format: string | false = false): string {
+        if (typeof format === 'string' && format.length) {
             return vm.$t('validation.date.format', context)
         }
 
@@ -131,45 +117,30 @@ export default {
     /**
      * The maximum value allowed.
      */
-    max (vm: Vue, context: ValidationContext): string {
-        const maximum = context.args[0] as number
-
+    max (vm: Vue, context: ValidationContext, maximum: string | number = 10, force?: string): string {
         if (Array.isArray(context.value)) {
             return vm.$tc('validation.max.array', maximum, context)
         }
-        const force = Array.isArray(context.args) && context.args[1] ? context.args[1] : false
+
         if ((!isNaN(context.value) && force !== 'length') || force === 'value') {
             return vm.$tc('validation.max.force', maximum, context)
         }
+
         return vm.$tc('validation.max.default', maximum, context)
     },
 
-    /**
-     * The (field-level) error message for mime errors.
-     */
-    mime (vm: Vue, context: ValidationContext): string {
-        const types = context.args[0]
-
-        if (types) {
-            return vm.$t('validation.mime.default', context)
-        } else {
-            return vm.$t('validation.mime.no_formats_allowed', context)
-        }
-    },
-
     /**
      * The maximum value allowed.
      */
-    min (vm: Vue, context: ValidationContext): string {
-        const minimum = context.args[0] as number
-
+    min (vm: Vue, context: ValidationContext, minimum: number | any = 1, force?: string): string {
         if (Array.isArray(context.value)) {
             return vm.$tc('validation.min.array', minimum, context)
         }
-        const force = Array.isArray(context.args) && context.args[1] ? context.args[1] : false
+
         if ((!isNaN(context.value) && force !== 'length') || force === 'value') {
             return vm.$tc('validation.min.force', minimum, context)
         }
+
         return vm.$tc('validation.min.default', minimum, context)
     },
 
diff --git a/src/validation/rules.ts b/src/validation/rules.ts
index 0ba29bf..12c0820 100644
--- a/src/validation/rules.ts
+++ b/src/validation/rules.ts
@@ -1,19 +1,23 @@
 import isUrl from 'is-url'
-import { shallowEqualObjects, regexForFormat, has } from '@/libs/utils'
-import { ValidatableData } from '@/validation/types'
+import { shallowEqualObjects, regexForFormat, has } from '@/utils'
+import { ValidationContext } from '@/validation/validator'
+
+interface DateValidationContext extends ValidationContext {
+    value: Date|string;
+}
 
 export default {
     /**
      * Rule: the value must be "yes", "on", "1", or true
      */
-    accepted ({ value }: ValidatableData): Promise<boolean> {
+    accepted ({ value }: ValidationContext): Promise<boolean> {
         return Promise.resolve(['yes', 'on', '1', 1, true, 'true'].includes(value))
     },
 
     /**
      * Rule: checks if a value is after a given date. Defaults to current time
      */
-    after ({ value }: { value: Date|string }, compare: string | false = false): Promise<boolean> {
+    after ({ value }: DateValidationContext, compare: string | false = false): Promise<boolean> {
         const timestamp = compare !== false ? Date.parse(compare) : Date.now()
         const fieldValue = value instanceof Date ? value.getTime() : Date.parse(value)
         return Promise.resolve(isNaN(fieldValue) ? false : (fieldValue > timestamp))
@@ -23,12 +27,12 @@ export default {
      * Rule: checks if the value is only alpha
      */
     alpha ({ value }: { value: string }, set = 'default'): Promise<boolean> {
-        const sets = {
+        const sets: Record<string, RegExp> = {
             default: /^[a-zA-ZÀ-ÖØ-öø-ÿ]+$/,
             latin: /^[a-zA-Z]+$/
         }
         const selectedSet = has(sets, set) ? set : 'default'
-        // @ts-ignore
+
         return Promise.resolve(sets[selectedSet].test(value))
     },
 
@@ -36,19 +40,19 @@ export default {
      * Rule: checks if the value is alpha numeric
      */
     alphanumeric ({ value }: { value: string }, set = 'default'): Promise<boolean> {
-        const sets = {
+        const sets: Record<string, RegExp> = {
             default: /^[a-zA-Z0-9À-ÖØ-öø-ÿ]+$/,
             latin: /^[a-zA-Z0-9]+$/
         }
         const selectedSet = has(sets, set) ? set : 'default'
-        // @ts-ignore
+
         return Promise.resolve(sets[selectedSet].test(value))
     },
 
     /**
      * Rule: checks if a value is after a given date. Defaults to current time
      */
-    before ({ value }: { value: Date|string }, compare: string|false = false): Promise<boolean> {
+    before ({ value }: DateValidationContext, compare: string|false = false): Promise<boolean> {
         const timestamp = compare !== false ? Date.parse(compare) : Date.now()
         const fieldValue = value instanceof Date ? value.getTime() : Date.parse(value)
         return Promise.resolve(isNaN(fieldValue) ? false : (fieldValue < timestamp))
@@ -80,13 +84,13 @@ export default {
      * Confirm that the value of one field is the same as another, mostly used
      * for password confirmations.
      */
-    confirm ({ value, getFormValues, name }: ValidatableData, field?: string): Promise<boolean> {
+    confirm ({ value, formValues, name }: ValidationContext, field?: string): Promise<boolean> {
         return Promise.resolve(((): boolean => {
             let confirmationFieldName = field
             if (!confirmationFieldName) {
                 confirmationFieldName = /_confirm$/.test(name) ? name.substr(0, name.length - 8) : `${name}_confirm`
             }
-            return getFormValues()[confirmationFieldName] === value
+            return formValues[confirmationFieldName] === value
         })())
     },
 
@@ -150,27 +154,6 @@ export default {
         }))
     },
 
-    /**
-     * Check the minimum value of a particular.
-     */
-    min ({ value }: { value: any }, minimum: number | any = 1, force?: string): Promise<boolean> {
-        return Promise.resolve(((): boolean => {
-            if (Array.isArray(value)) {
-                minimum = !isNaN(minimum) ? Number(minimum) : minimum
-                return value.length >= minimum
-            }
-            if ((!isNaN(value) && force !== 'length') || force === 'value') {
-                value = !isNaN(value) ? Number(value) : value
-                return value >= minimum
-            }
-            if (typeof value === 'string' || (force === 'length')) {
-                value = !isNaN(value) ? value.toString() : value
-                return value.length >= minimum
-            }
-            return false
-        })())
-    },
-
     /**
      * Check the maximum value of a particular.
      */
@@ -192,6 +175,27 @@ export default {
         })())
     },
 
+    /**
+     * Check the minimum value of a particular.
+     */
+    min ({ value }: { value: any }, minimum: number | any = 1, force?: string): Promise<boolean> {
+        return Promise.resolve(((): boolean => {
+            if (Array.isArray(value)) {
+                minimum = !isNaN(minimum) ? Number(minimum) : minimum
+                return value.length >= minimum
+            }
+            if ((!isNaN(value) && force !== 'length') || force === 'value') {
+                value = !isNaN(value) ? Number(value) : value
+                return value >= minimum
+            }
+            if (typeof value === 'string' || (force === 'length')) {
+                value = !isNaN(value) ? value.toString() : value
+                return value.length >= minimum
+            }
+            return false
+        })())
+    },
+
     /**
      * Rule: Value is not in stack.
      */
diff --git a/src/validation/types.ts b/src/validation/types.ts
deleted file mode 100644
index 65108ca..0000000
--- a/src/validation/types.ts
+++ /dev/null
@@ -1,34 +0,0 @@
-export interface ValidatableData {
-    // The value of the field (do not mutate!),
-    value: any;
-    // If wrapped in a FormulateForm, the value of other form fields.
-    getFormValues(): Record<string, any>;
-    // The validation name to be used
-    name: string;
-}
-
-export interface ValidationContext {
-    // The value of the field (do not mutate!),
-    value: any;
-    // If wrapped in a FormulateForm, the value of other form fields.
-    formValues: Record<string, any>;
-    // The validation name to be used
-    name: string;
-    // Array of rule arguments: between:5,10 (args are ['5', '10'])
-    args: any[];
-}
-
-export interface ValidationRule {
-    (context: ValidatableData, ...args: any[]): Promise<boolean>;
-}
-
-export interface ValidationError {
-    rule?: string;
-    context?: ValidationContext;
-    message: string;
-}
-
-export interface ValidationErrorBag {
-    name: string;
-    errors: ValidationError[];
-}
diff --git a/src/validation/validator.ts b/src/validation/validator.ts
index c2eab3a..225dc43 100644
--- a/src/validation/validator.ts
+++ b/src/validation/validator.ts
@@ -1,12 +1,31 @@
-import {
-    ValidatableData,
-    ValidationRule,
-} from '@/validation/types'
+import { has, snakeToCamel } from '@/utils'
 
-export type Validator = {
-    name?: string;
-    rule: ValidationRule;
+export interface Validator {
+    (context: ValidationContext): Promise<Violation|null>;
+}
+
+export interface Violation {
+    rule: string|null;
     args: any[];
+    context: ValidationContext|null;
+    message: string;
+}
+
+export interface CheckRuleFn {
+    (context: ValidationContext, ...args: any[]): Promise<boolean>|boolean;
+}
+
+export interface CreateMessageFn {
+    (context: ValidationContext, ...args: any[]): string;
+}
+
+export interface ValidationContext {
+    // The value of the field (do not mutate!),
+    value: any;
+    // If wrapped in a FormulateForm, the value of other form fields.
+    formValues: Record<string, any>;
+    // The validation name to be used
+    name: string;
 }
 
 export type ValidatorGroup = {
@@ -14,6 +33,124 @@ export type ValidatorGroup = {
     bail: boolean;
 }
 
+export function createValidator (
+    ruleFn: CheckRuleFn,
+    ruleName: string|null,
+    ruleArgs: any[],
+    messageFn: CreateMessageFn
+): Validator {
+    return (context: ValidationContext): Promise<Violation|null> => {
+        return Promise.resolve(ruleFn(context, ...ruleArgs))
+            .then(valid => {
+                return !valid ? {
+                    rule: ruleName,
+                    args: ruleArgs,
+                    context,
+                    message: messageFn(context, ...ruleArgs),
+                } : null
+            })
+    }
+}
+
+export function parseModifier (ruleName: string): [string, string|null] {
+    if (/^[\^]/.test(ruleName.charAt(0))) {
+        return [snakeToCamel(ruleName.substr(1)), ruleName.charAt(0)]
+    }
+    return [snakeToCamel(ruleName), null]
+}
+
+export function processSingleArrayConstraint (
+    constraint: any[],
+    rules: Record<string, CheckRuleFn>,
+    messages: Record<string, CreateMessageFn>
+): [Validator, string|null, string|null] {
+    const args = constraint.slice()
+    const first = args.shift()
+
+    if (typeof first === 'function') {
+        return [first, null, null]
+    }
+
+    if (typeof first !== 'string') {
+        throw new Error('[Formulario]: For array constraint first element must be rule name or Validator function')
+    }
+
+    const [name, modifier] = parseModifier(first)
+
+    if (has(rules, name)) {
+        return [
+            createValidator(
+                rules[name],
+                name,
+                args,
+                messages[name] || messages.default
+            ),
+            name,
+            modifier,
+        ]
+    }
+
+    throw new Error(`[Formulario] Can't create validator for constraint: ${JSON.stringify(constraint)}`)
+}
+
+export function processSingleStringConstraint (
+    constraint: string,
+    rules: Record<string, CheckRuleFn>,
+    messages: Record<string, CreateMessageFn>
+): [Validator, string|null, string|null] {
+    const args = constraint.split(':')
+    const [name, modifier] = parseModifier(args.shift() || '')
+
+    if (has(rules, name)) {
+        return [
+            createValidator(
+                rules[name],
+                name,
+                args.length ? args.join(':').split(',') : [],
+                messages[name] || messages.default
+            ),
+            name,
+            modifier,
+        ]
+    }
+
+    throw new Error(`[Formulario] Can't create validator for constraint: ${constraint}`)
+}
+
+export function processSingleConstraint (
+    constraint: string|Validator|[Validator|string, ...any[]],
+    rules: Record<string, CheckRuleFn>,
+    messages: Record<string, CreateMessageFn>
+): [Validator, string|null, string|null] {
+    if (typeof constraint === 'function') {
+        return [constraint, null, null]
+    }
+
+    if (Array.isArray(constraint) && constraint.length) {
+        return processSingleArrayConstraint(constraint, rules, messages)
+    }
+
+    if (typeof constraint === 'string') {
+        return processSingleStringConstraint(constraint, rules, messages)
+    }
+
+    return [(): Promise<Violation|null> => Promise.resolve(null), null, null]
+}
+
+export function processConstraints (
+    constraints: string|any[],
+    rules: Record<string, CheckRuleFn>,
+    messages: Record<string, CreateMessageFn>
+): [Validator, string|null, string|null][] {
+    if (typeof constraints === 'string') {
+        return processConstraints(constraints.split('|').filter(f => f.length), rules, messages)
+    }
+    if (!Array.isArray(constraints)) {
+        return []
+    }
+    return constraints.map(constraint => processSingleConstraint(constraint, rules, messages))
+}
+
 export function enlarge (groups: ValidatorGroup[]): ValidatorGroup[] {
     const enlarged: ValidatorGroup[] = []
 
@@ -46,25 +183,20 @@ export function enlarge (groups: ValidatorGroup[]): ValidatorGroup[] {
  * [[required, min, max]]
  * @param {array} rules
  */
-export function createValidatorGroups (rules: [ValidationRule, any[], string, string|null][]): ValidatorGroup[] {
-    const mapper = ([
-        rule,
-        args,
-        name,
-        modifier
-    ]: [ValidationRule, any[], string, any]): ValidatorGroup => ({
-        validators: [{ name, rule, args }],
+export function createValidatorGroups (rules: [Validator, string|null, string|null][]): ValidatorGroup[] {
+    const mapper = ([validator, /** name */, modifier]: [Validator, string|null, string|null]): ValidatorGroup => ({
+        validators: [validator],
         bail: modifier === '^',
     })
 
     const groups: ValidatorGroup[] = []
 
-    const bailIndex = rules.findIndex(([,, rule]) => rule.toLowerCase() === 'bail')
+    const bailIndex = rules.findIndex(([, name]) => name && name.toLowerCase() === 'bail')
 
     if (bailIndex >= 0) {
         groups.push(...enlarge(rules.splice(0, bailIndex + 1).slice(0, -1).map(mapper)))
-        groups.push(...rules.map(([rule, args, name]) => ({
-            validators: [{ rule, args, name }],
+        groups.push(...rules.map(([validator]) => ({
+            validators: [validator],
             bail: true,
         })))
     } else {
@@ -74,6 +206,33 @@ export function createValidatorGroups (rules: [ValidationRule, any[], string, st
     return groups
 }
 
-export function validate (validator: Validator, data: ValidatableData): Promise<boolean> {
-    return Promise.resolve(validator.rule(data, ...validator.args))
+function validateByGroup (group: ValidatorGroup, context: ValidationContext): Promise<Violation[]> {
+    return Promise.all(
+        group.validators.map(validate => validate(context))
+    )
+        .then(violations => (violations.filter(v => v !== null) as Violation[]))
+}
+
+export function validate (
+    validators: [Validator, string|null, string|null][],
+    context: ValidationContext
+): Promise<Violation[]> {
+    return new Promise(resolve => {
+        const resolveGroups = (groups: ValidatorGroup[], all: Violation[] = []): void => {
+            if (groups.length) {
+                const current = groups.shift() as ValidatorGroup
+
+                validateByGroup(current, context).then(violations => {
+                    // The rule passed or its a non-bailing group, and there are additional groups to check, continue
+                    if ((violations.length === 0 || !current.bail) && groups.length) {
+                        return resolveGroups(groups, all.concat(violations))
+                    }
+                    return resolve(all.concat(violations))
+                })
+            } else {
+                resolve([])
+            }
+        }
+        resolveGroups(createValidatorGroups(validators))
+    })
 }
diff --git a/storybook/stories/FormularioGrouping.tale.vue b/storybook/stories/FormularioGrouping.tale.vue
index 9d1c518..30eaae0 100644
--- a/storybook/stories/FormularioGrouping.tale.vue
+++ b/storybook/stories/FormularioGrouping.tale.vue
@@ -21,7 +21,7 @@
                     :key="index"
                     class="text-danger"
                 >
-                    {{ error.message }}
+                    {{ error }}
                 </div>
             </FormularioInput>
 
@@ -46,7 +46,7 @@
                     :key="index"
                     class="text-danger"
                 >
-                    {{ error.message }}
+                    {{ error }}
                 </div>
             </FormularioInput>
         </FormularioGrouping>
diff --git a/storybook/stories/FormularioInput.tale.vue b/storybook/stories/FormularioInput.tale.vue
index 730b66e..cc71fc9 100644
--- a/storybook/stories/FormularioInput.tale.vue
+++ b/storybook/stories/FormularioInput.tale.vue
@@ -49,7 +49,7 @@
                 :key="index"
                 class="text-danger"
             >
-                {{ error.message }}
+                {{ error }}
             </div>
         </FormularioInput>
 
diff --git a/test/unit/FormularioForm.test.js b/test/unit/FormularioForm.test.js
index 1411448..78d5cc5 100644
--- a/test/unit/FormularioForm.test.js
+++ b/test/unit/FormularioForm.test.js
@@ -88,7 +88,7 @@ describe('FormularioForm', () => {
             propsData: { formularioValue: { test: 'has initial value' } },
             slots: {
                 default: `
-                    <FormularioInput v-slot="{ context }" formulario-value="123" name="test" >
+                    <FormularioInput v-slot="{ context }" name="test" value="123">
                         <input v-model="context.model" type="text">
                     </FormularioInput>
                 `
@@ -164,30 +164,39 @@ describe('FormularioForm', () => {
     it('Updates calls setFieldValue on form when a field contains a populated v-model on registration', () => {
         const wrapper = mount(FormularioForm, {
             propsData: {
-                formularioValue: { test: '123' }
+                formularioValue: { test: 'Initial' }
             },
             slots: {
-                default: '<FormularioInput name="test" formulario-value="override-data" />'
-            }
+                default: '<FormularioInput name="test" value="Overrides" />'
+            },
         })
-        expect(wrapper.emitted().input[wrapper.emitted().input.length - 1]).toEqual([{ test: 'override-data' }])
+
+        const emitted = wrapper.emitted('input')
+
+        expect(emitted).toBeTruthy()
+        expect(emitted[emitted.length - 1]).toEqual([{ test: 'Overrides' }])
     })
 
     it('updates an inputs value when the form v-model is modified', async () => {
         const wrapper = mount({
-            data: () => ({ formValues: { test: 'abcd' } }),
+            data: () => ({ values: { test: 'abcd' } }),
             template: `
-                <FormularioForm v-model="formValues">
+                <FormularioForm v-model="values">
                     <FormularioInput v-slot="{ context }" name="test" >
                         <input v-model="context.model" type="text">
                     </FormularioInput>
                 </FormularioForm>
             `
         })
+
+        wrapper.vm.values = { test: '1234' }
+
         await flushPromises()
-        wrapper.vm.formValues = { test: '1234' }
-        await flushPromises()
-        expect(wrapper.find('input[type="text"]').element['value']).toBe('1234')
+
+        const input = wrapper.find('input[type="text"]')
+
+        expect(input).toBeTruthy()
+        expect(input.element['value']).toBe('1234')
     })
 
     it('Resolves hasValidationErrors to true', async () => {
@@ -242,7 +251,7 @@ describe('FormularioForm', () => {
             slots: {
                 default: `
                     <FormularioInput v-slot="{ context }" name="fieldWithErrors">
-                        <span v-for="error in context.allErrors">{{ error.message }}</span>
+                        <span v-for="error in context.errors">{{ error }}</span>
                     </FormularioInput>
                 `
             }
@@ -289,7 +298,7 @@ describe('FormularioForm', () => {
             slots: {
                 default: `
                     <FormularioInput v-slot="{ context }" name="foo" validation="required|in:foo">
-                        <input v-model="context.model" type="text" @blur="context.blurHandler">
+                        <input v-model="context.model" type="text" @blur="context.runValidation()">
                     </FormularioInput>
                     <FormularioInput name="bar" validation="required" />
                 `,
@@ -304,7 +313,7 @@ describe('FormularioForm', () => {
         expect(wrapper.emitted('validation').length).toBe(1)
         expect(wrapper.emitted('validation')[0][0]).toEqual({
             name: 'foo',
-            errors: [],
+            violations: [],
         })
     })
 
@@ -312,7 +321,7 @@ describe('FormularioForm', () => {
         const wrapper = mount(FormularioForm, {
             slots: { default: `
                 <FormularioInput v-slot="{ context }" name="foo" validation="required|in:foo">
-                    <input v-model="context.model" type="text" @blur="context.blurHandler">
+                    <input v-model="context.model" type="text" @blur="context.runValidation()">
                 </FormularioInput>
                 <FormularioInput name="bar" validation="required" />
             ` }
@@ -326,7 +335,7 @@ describe('FormularioForm', () => {
         expect(wrapper.emitted('validation').length).toBe(1)
         expect(wrapper.emitted('validation')[0][0]).toEqual({
             name: 'foo',
-            errors: [ expect.any(Object) ], // @TODO: Check object structure
+            violations: [ expect.any(Object) ], // @TODO: Check object structure
         })
     })
 
@@ -390,6 +399,6 @@ describe('FormularioForm', () => {
 
         await flushPromises()
         expect(Object.keys(wrapper.vm.$refs.form.mergedFieldErrors).length).toBe(0)
-        expect(wrapper.vm.values).toEqual({})
+        expect(wrapper.vm['values']).toEqual({})
     })
 })
diff --git a/test/unit/FormularioGrouping.test.js b/test/unit/FormularioGrouping.test.js
index 40448c7..2bb5424 100644
--- a/test/unit/FormularioGrouping.test.js
+++ b/test/unit/FormularioGrouping.test.js
@@ -53,7 +53,7 @@ describe('FormularioGrouping', () => {
                 `
             }
         })
-        expect(wrapper.find('input[type="text"]').element.value).toBe('Group text')
+        expect(wrapper.find('input[type="text"]').element['value']).toBe('Group text')
     })
 
     it('Data reactive with grouped fields', async () => {
@@ -86,7 +86,7 @@ describe('FormularioGrouping', () => {
                 default: `
                     <FormularioGrouping name="group">
                         <FormularioInput ref="input" name="text" v-slot="{ context }">
-                            <span v-for="error in context.allErrors">{{ error }}</span>
+                            <span v-for="error in context.errors">{{ error }}</span>
                         </FormularioInput>
                     </FormularioGrouping>
                 `,
diff --git a/test/unit/FormularioInput.test.js b/test/unit/FormularioInput.test.js
index 8964f8b..9f732fc 100644
--- a/test/unit/FormularioInput.test.js
+++ b/test/unit/FormularioInput.test.js
@@ -9,34 +9,34 @@ import FormularioInput from '@/FormularioInput.vue'
 const globalRule = jest.fn(() => { return false })
 
 Vue.use(Formulario, {
-    rules: { globalRule },
+    validationRules: { globalRule },
     validationMessages: {
         required: () => 'required',
         'in': () => 'in',
         min: () => 'min',
         globalRule: () => 'globalRule',
-    }
+    },
 })
 
 describe('FormularioInput', () => {
-    it('allows custom field-rule level validation strings', async () => {
+    it('Allows custom field-rule level validation strings', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
+                value: 'other value',
                 validation: 'required|in:abcdef',
-                validationMessages: {in: 'the value was different than expected'},
-                errorBehavior: 'live',
-                value: 'other value'
+                validationMessages: { in: 'the value was different than expected' },
+                validationBehavior: 'live',
             },
             scopedSlots: {
-                default: `<div><span v-for="error in props.context.allErrors">{{ error.message }}</span></div>`
+                default: `<div><span v-for="violation in props.context.violations">{{ violation.message }}</span></div>`
             },
         })
         await flushPromises()
         expect(wrapper.find('span').text()).toBe('the value was different than expected')
     })
 
-    it('no validation on created when errorBehavior is not live', async () => {
+    it('No validation on created when validationBehavior is not live', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
@@ -45,145 +45,142 @@ describe('FormularioInput', () => {
                 value: 'other value'
             },
             scopedSlots: {
-                default: `<div><span v-for="error in props.context.allErrors">{{ error.message }}</span></div>`
+                default: `<div><span v-for="error in props.context.violations">{{ error.message }}</span></div>`
             }
         })
         await flushPromises()
         expect(wrapper.find('span').exists()).toBe(false)
     })
 
-    it('no validation on value change when errorBehavior is not live', async () => {
+    it('No validation on value change when validationBehavior is "submit"', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
                 validation: 'required|in:abcdef',
                 validationMessages: {in: 'the value was different than expected'},
-                errorBehavior: 'submit',
-                value: 'other value'
+                validationBehavior: 'submit',
+                value: 'Initial'
             },
             scopedSlots: {
                 default: `<div>
                     <input type="text" v-model="props.context.model">
-                    <span v-for="error in props.context.allErrors">{{ error.message }}</span>
+                    <span v-for="error in props.context.violations">{{ error.message }}</span>
                 </div>`
             }
         })
+
         await flushPromises()
+
         expect(wrapper.find('span').exists()).toBe(false)
 
-        const input = wrapper.find('input[type="text"]')
-        input.element.value = 'test'
-        input.trigger('input')
+        wrapper.find('input[type="text"]').element['value'] = 'Test'
+        wrapper.find('input[type="text"]').trigger('change')
+
         await flushPromises()
-        expect(wrapper.find('input[type="text"]').element.value).toBe('test')
+
+        expect(wrapper.find('input[type="text"]').element['value']).toBe('Test')
         expect(wrapper.find('span').exists()).toBe(false)
     })
 
-    it('allows custom field-rule level validation functions', async () => {
+    it('Allows custom field-rule level validation functions', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
                 validation: 'required|in:abcdef',
                 validationMessages: { in: ({ value }) => `The string ${value} is not correct.` },
-                errorBehavior: 'live',
+                validationBehavior: 'live',
                 value: 'other value'
             },
             scopedSlots: {
-                default: `<div><span v-for="error in props.context.allErrors">{{ error.message }}</span></div>`
+                default: `<div><span v-for="error in props.context.violations">{{ error.message }}</span></div>`
             }
         })
         await flushPromises()
         expect(wrapper.find('span').text()).toBe('The string other value is not correct.')
     })
 
-    it('no validation on created when errorBehavior is not live', async () => {
+    it('No validation on created when validationBehavior is default', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
                 validation: 'required|in:abcdef',
-                validationMessages: {in: 'the value was different than expected'},
+                validationMessages: { in: 'the value was different than expected' },
                 value: 'other value'
             },
             scopedSlots: {
-                default: `<div><span v-for="error in props.context.allErrors">{{ error.message }}</span></div>`
+                default: `<div><span v-for="error in props.context.violations">{{ error.message }}</span></div>`
             }
         })
         await flushPromises()
         expect(wrapper.find('span').exists()).toBe(false)
     })
 
-    it('uses custom async validation rules on defined on the field', async () => {
+    it('Uses custom async validation rules on defined on the field', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
                 validation: 'required|foobar',
-                validationMessages: {
-                    foobar: 'failed the foobar check'
-                },
-                validationRules: {
-                    foobar: async ({ value }) => value === 'foo'
-                },
-                errorBehavior: 'live',
+                validationRules: { foobar: async ({ value }) => value === 'foo' },
+                validationMessages: { foobar: 'failed the foobar check' },
+                validationBehavior: 'live',
                 value: 'bar'
             },
             scopedSlots: {
-                default: `<div><span v-for="error in props.context.allErrors">{{ error.message }}</span></div>`
+                default: `<div><span v-for="error in props.context.violations">{{ error.message }}</span></div>`
             }
         })
         await flushPromises()
         expect(wrapper.find('span').text()).toBe('failed the foobar check')
     })
 
-    it('uses custom sync validation rules on defined on the field', async () => {
+    it('Uses custom sync validation rules on defined on the field', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
+                value: 'bar',
                 validation: 'required|foobar',
-                validationMessages: {
-                    foobar: 'failed the foobar check'
-                },
-                validationRules: {
-                    foobar: ({ value }) => value === 'foo'
-                },
-                errorBehavior: 'live',
-                value: 'bar'
+                validationRules: { foobar: ({ value }) => value === 'foo' },
+                validationMessages: { foobar: 'failed the foobar check' },
+                validationBehavior: 'live',
             },
             scopedSlots: {
-                default: `<div><span v-for="error in props.context.allErrors">{{ error.message }}</span></div>`
+                default: `<div><span v-for="error in props.context.violations">{{ error.message }}</span></div>`
             }
         })
         await flushPromises()
         expect(wrapper.find('span').text()).toBe('failed the foobar check')
     })
 
-    it('uses global custom validation rules', async () => {
+    it('Uses global custom validation rules', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
                 name: 'test',
+                value: 'bar',
                 validation: 'required|globalRule',
-                errorBehavior: 'live',
-                value: 'bar'
+                validationBehavior: 'live',
             }
         })
         await flushPromises()
         expect(globalRule.mock.calls.length).toBe(1)
     })
 
-    it('emits correct validation event', async () => {
+    it('Emits correct validation event', async () => {
         const wrapper = mount(FormularioInput, {
             propsData: {
-                validation: 'required',
-                errorBehavior: 'live',
+                name: 'fieldName',
                 value: '',
-                name: 'testinput',
+                validation: 'required',
+                validationBehavior: 'live',
             }
         })
         await flushPromises()
-        const errorObject = wrapper.emitted('validation')[0][0]
-        expect(errorObject).toEqual({
-            name: 'testinput',
-            errors: [{
+
+        expect(wrapper.emitted('validation')).toBeTruthy()
+        expect(wrapper.emitted('validation')[0][0]).toEqual({
+            name: 'fieldName',
+            violations: [{
                 rule: expect.stringContaining('required'),
+                args: expect.any(Array),
                 context: expect.any(Object),
                 message: expect.any(String),
             }],
@@ -192,86 +189,90 @@ describe('FormularioInput', () => {
 
     it('Can bail on validation when encountering the bail rule', async () => {
         const wrapper = mount(FormularioInput, {
-            propsData: { name: 'test', validation: 'bail|required|in:xyz', errorBehavior: 'live' }
+            propsData: {
+                name: 'test',
+                validation: 'bail|required|in:xyz',
+                validationBehavior: 'live',
+            },
         })
         await flushPromises();
-        expect(wrapper.vm.context.validationErrors.length).toBe(1);
+        expect(wrapper.vm.context.violations.length).toBe(1);
     })
 
-    it('can show multiple validation errors if they occur before the bail rule', async () => {
+    it('Can show multiple validation errors if they occur before the bail rule', async () => {
         const wrapper = mount(FormularioInput, {
-            propsData: { name: 'test', validation: 'required|in:xyz|bail', errorBehavior: 'live' }
+            propsData: {
+                name: 'test',
+                validation: 'required|in:xyz|bail',
+                validationBehavior: 'live',
+            },
         })
         await flushPromises();
-        expect(wrapper.vm.context.validationErrors.length).toBe(2);
+        expect(wrapper.vm.context.violations.length).toBe(2);
     })
 
-    it('can avoid bail behavior by using modifier', async () => {
+    it('Can avoid bail behavior by using modifier', async () => {
         const wrapper = mount(FormularioInput, {
-            propsData: { name: 'test', validation: '^required|in:xyz|min:10,length', errorBehavior: 'live', value: '123' }
+            propsData: {
+                name: 'test',
+                value: '123',
+                validation: '^required|in:xyz|min:10,length',
+                validationBehavior: 'live',
+            },
         })
         await flushPromises();
-        expect(wrapper.vm.context.validationErrors.length).toBe(2);
+        expect(wrapper.vm.context.violations.length).toBe(2);
     })
 
-    it('prevents later error messages when modified rule fails', async () => {
+    it('Prevents later error messages when modified rule fails', async () => {
         const wrapper = mount(FormularioInput, {
-            propsData: { name: 'test', validation: '^required|in:xyz|min:10,length', errorBehavior: 'live' }
+            propsData: {
+                name: 'test',
+                validation: '^required|in:xyz|min:10,length',
+                validationBehavior: 'live',
+            },
         })
         await flushPromises();
-        expect(wrapper.vm.context.validationErrors.length).toBe(1);
+        expect(wrapper.vm.context.violations.length).toBe(1);
     })
 
     it('can bail in the middle of the rule set with a modifier', async () => {
         const wrapper = mount(FormularioInput, {
-            propsData: { name: 'test', validation: 'required|^in:xyz|min:10,length', errorBehavior: 'live' }
+            propsData: {
+                name: 'test',
+                validation: 'required|^in:xyz|min:10,length',
+                validationBehavior: 'live',
+            },
         })
         await flushPromises();
-        expect(wrapper.vm.context.validationErrors.length).toBe(2);
+        expect(wrapper.vm.context.violations.length).toBe(2);
     })
 
-    it('does not show errors on blur when set error-behavior is submit', async () => {
-        const wrapper = mount(FormularioInput, {
-            propsData: {
-                validation: 'required',
-                errorBehavior: 'submit',
-                name: 'test',
-            },
-            scopedSlots: {
-                default: `
-                    <div>
-                        <input v-model="props.context.model" @blur="props.context.blurHandler">
-                        <span v-if="props.context.formShouldShowErrors" v-for="error in props.context.allErrors">{{ error.message }}</span>
-                    </div>
-                `
-            }
-        })
-
-        expect(wrapper.find('span').exists()).toBe(false)
-        wrapper.find('input').trigger('input')
-        wrapper.find('input').trigger('blur')
-        await flushPromises()
-        expect(wrapper.find('span').exists()).toBe(false)
-    })
-
-    it('displays errors when error-behavior is submit and form is submitted', async () => {
+    it('Displays errors when validation-behavior is submit and form is submitted', async () => {
         const wrapper = mount(FormularioForm, {
             propsData: { name: 'test' },
             slots: {
                 default: `
-                    <FormularioInput v-slot="inputProps" validation="required" name="testinput" error-behavior="submit">
-                        <span v-for="error in inputProps.context.allErrors">{{ error.message }}</span>
+                    <FormularioInput
+                        v-slot="{ context }"
+                        name="testinput"
+                        validation="required"
+                        validation-behavior="submit"
+                    >
+                        <span v-for="error in context.violations">{{ error.message }}</span>
                     </FormularioInput>
                 `
             }
         })
 
         await flushPromises()
+
         expect(wrapper.find('span').exists()).toBe(false)
 
         wrapper.trigger('submit')
 
         await flushPromises()
+
         expect(wrapper.find('span').exists()).toBe(true)
     })
 })
diff --git a/test/unit/utils.test.js b/test/unit/utils.test.js
deleted file mode 100644
index d663f2a..0000000
--- a/test/unit/utils.test.js
+++ /dev/null
@@ -1,174 +0,0 @@
-import { cloneDeep, isScalar, parseRules, regexForFormat, snakeToCamel } from '@/libs/utils'
-import rules from '@/validation/rules.ts'
-
-describe('parseRules', () => {
-  it('parses single string rules, returning empty arguments array', () => {
-    expect(parseRules('required', rules)).toEqual([
-      [rules.required, [], 'required', null]
-    ])
-  })
-
-  it('throws errors for invalid validation rules', () => {
-    expect(() => {
-      parseRules('required|notarule', rules, null)
-    }).toThrow()
-  })
-
-  it('parses arguments for a rule', () => {
-    expect(parseRules('in:foo,bar', rules)).toEqual([
-      [rules.in, ['foo', 'bar'], 'in', null]
-    ])
-  })
-
-  it('parses multiple string rules and arguments', () => {
-    expect(parseRules('required|in:foo,bar', rules)).toEqual([
-      [rules.required, [], 'required', null],
-      [rules.in, ['foo', 'bar'], 'in', null]
-    ])
-  })
-
-  it('parses multiple array rules and arguments', () => {
-    expect(parseRules(['required', 'in:foo,bar'], rules)).toEqual([
-      [rules.required, [], 'required', null],
-      [rules.in, ['foo', 'bar'], 'in', null]
-    ])
-  })
-
-  it('parses array rules with expression arguments', () => {
-    expect(parseRules([
-      ['matches', /^abc/, '1234']
-    ], rules)).toEqual([
-      [rules.matches, [/^abc/, '1234'], 'matches', null]
-    ])
-  })
-
-  it('parses string rules with caret modifier', () => {
-    expect(parseRules('^required|min:10', rules)).toEqual([
-      [rules.required, [], 'required', '^'],
-      [rules.min, ['10'], 'min', null],
-    ])
-  })
-
-  it('parses array rule with caret modifier', () => {
-    expect(parseRules([['required'], ['^max', '10']], rules)).toEqual([
-      [rules.required, [], 'required', null],
-      [rules.max, ['10'], 'max', '^'],
-    ])
-  })
-})
-
-
-describe('regexForFormat', () => {
-  it('allows MM format with other characters', () => expect(regexForFormat('abc/MM').test('abc/01')).toBe(true))
-
-  it('fails MM format with single digit', () => expect(regexForFormat('abc/MM').test('abc/1')).toBe(false))
-
-  it('allows M format with single digit', () => expect(regexForFormat('M/abc').test('1/abc')).toBe(true))
-
-  it('fails MM format when out of range', () => expect(regexForFormat('M/abc').test('13/abc')).toBe(false))
-
-  it('fails M format when out of range', () => expect(regexForFormat('M/abc').test('55/abc')).toBe(false))
-
-  it('Replaces double digits before singles', () => expect(regexForFormat('MMM').test('313131')).toBe(false))
-
-  it('allows DD format with zero digit', () => expect(regexForFormat('xyz/DD').test('xyz/01')).toBe(true))
-
-  it('fails DD format with single digit', () => expect(regexForFormat('xyz/DD').test('xyz/9')).toBe(false))
-
-  it('allows D format with single digit', () => expect(regexForFormat('xyz/D').test('xyz/9')).toBe(true))
-
-  it('fails D format with out of range digit', () => expect(regexForFormat('xyz/D').test('xyz/92')).toBe(false))
-
-  it('fails DD format with out of range digit', () => expect(regexForFormat('xyz/D').test('xyz/32')).toBe(false))
-
-  it('allows YY format with double zeros', () => expect(regexForFormat('YY').test('00')).toBe(true))
-
-  it('fails YY format with four zeros', () => expect(regexForFormat('YY').test('0000')).toBe(false))
-
-  it('allows YYYY format with four zeros', () => expect(regexForFormat('YYYY').test('0000')).toBe(true))
-
-  it('allows MD-YY', () => expect(regexForFormat('MD-YY').test('12-00')).toBe(true))
-
-  it('allows DM-YY', () => expect(regexForFormat('DM-YY').test('12-00')).toBe(true))
-
-  it('allows date like MM/DD/YYYY', () => expect(regexForFormat('MM/DD/YYYY').test('12/18/1987')).toBe(true))
-
-  it('allows date like YYYY-MM-DD', () => expect(regexForFormat('YYYY-MM-DD').test('1987-01-31')).toBe(true))
-
-  it('fails date like YYYY-MM-DD with out of bounds day', () => expect(regexForFormat('YYYY-MM-DD').test('1987-01-32')).toBe(false))
-})
-
-describe('isScalar', () => {
-  it('passes on strings', () => expect(isScalar('hello')).toBe(true))
-
-  it('passes on numbers', () => expect(isScalar(123)).toBe(true))
-
-  it('passes on booleans', () => expect(isScalar(false)).toBe(true))
-
-  it('passes on symbols', () => expect(isScalar(Symbol(123))).toBe(true))
-
-  it('passes on null', () => expect(isScalar(null)).toBe(true))
-
-  it('passes on undefined', () => expect(isScalar(undefined)).toBe(true))
-
-  it('fails on pojo', () => expect(isScalar({})).toBe(false))
-})
-
-describe('cloneDeep', () => {
-  it('basic objects stay the same', () => expect(cloneDeep({ a: 123, b: 'hello' })).toEqual({ a: 123, b: 'hello' }))
-
-  it('basic nested objects stay the same', () => {
-    expect(cloneDeep({ a: 123, b: { c: 'hello-world' } }))
-    .toEqual({ a: 123, b: { c: 'hello-world' } })
-  })
-
-  it('simple pojo reference types are re-created', () => {
-    const c = { c: 'hello-world' }
-    const clone = cloneDeep({ a: 123, b: c })
-    expect(clone.b === c).toBe(false)
-  })
-
-  it('retains array structures inside of a pojo', () => {
-    const obj = { a: 'abcd', d: ['first', 'second'] }
-    const clone = cloneDeep(obj)
-    expect(Array.isArray(clone.d)).toBe(true)
-  })
-
-  it('removes references inside array structures', () => {
-    const deepObj = {foo: 'bar'}
-    const obj = { a: 'abcd', d: ['first', deepObj] }
-    const clone = cloneDeep(obj)
-    expect(clone.d[1] === deepObj).toBe(false)
-  })
-})
-
-describe('snakeToCamel', () => {
-  it('converts underscore separated words to camelCase', () => {
-    expect(snakeToCamel('this_is_snake_case')).toBe('thisIsSnakeCase')
-  })
-
-  it('converts underscore separated words to camelCase even if they start with a number', () => {
-    expect(snakeToCamel('this_is_snake_case_2nd_example')).toBe('thisIsSnakeCase2ndExample')
-  })
-
-  it('has no effect on already camelCase words', () => {
-    expect(snakeToCamel('thisIsCamelCase')).toBe('thisIsCamelCase')
-  })
-
-  it('does not capitalize the first word or strip first underscore if a phrase starts with an underscore', () => {
-    expect(snakeToCamel('_this_starts_with_an_underscore')).toBe('_thisStartsWithAnUnderscore')
-  })
-
-  it('ignores double underscores anywhere in a word', () => {
-    expect(snakeToCamel('__unlikely__thing__')).toBe('__unlikely__thing__')
-  })
-
-  it('has no effect hyphenated words', () => {
-    expect(snakeToCamel('not-a-good-name')).toBe('not-a-good-name')
-  })
-
-  it('returns the same function if passed', () => {
-    const fn = () => {}
-    expect(snakeToCamel(fn)).toBe(fn)
-  })
-})
diff --git a/test/unit/utils/clone.test.js b/test/unit/utils/clone.test.js
new file mode 100644
index 0000000..541ac25
--- /dev/null
+++ b/test/unit/utils/clone.test.js
@@ -0,0 +1,28 @@
+import clone from '@/utils/clone'
+
+describe('clone', () => {
+    it('Basic objects stay the same', () => {
+        const obj = { a: 123, b: 'hello' }
+        expect(clone(obj)).toEqual(obj)
+    })
+
+    it('Basic nested objects stay the same', () => {
+        const obj = { a: 123, b: { c: 'hello-world' } }
+        expect(clone(obj)).toEqual(obj)
+    })
+
+    it('Simple pojo reference types are re-created', () => {
+        const c = { c: 'hello-world' }
+        expect(clone({ a: 123, b: c }).b === c).toBe(false)
+    })
+
+    it('Retains array structures inside of a pojo', () => {
+        const obj = { a: 'abcd', d: ['first', 'second'] }
+        expect(Array.isArray(clone(obj).d)).toBe(true)
+    })
+
+    it('Removes references inside array structures', () => {
+        const obj = { a: 'abcd', d: ['first', { foo: 'bar' }] }
+        expect(clone(obj).d[1] === obj.d[1]).toBe(false)
+    })
+})
diff --git a/test/unit/utils/isScalar.test.js b/test/unit/utils/isScalar.test.js
new file mode 100644
index 0000000..6965697
--- /dev/null
+++ b/test/unit/utils/isScalar.test.js
@@ -0,0 +1,17 @@
+import isScalar from '@/utils/isScalar'
+
+describe('isScalar', () => {
+    it('Passes on strings', () => expect(isScalar('hello')).toBe(true))
+
+    it('Passes on numbers', () => expect(isScalar(123)).toBe(true))
+
+    it('Passes on booleans', () => expect(isScalar(false)).toBe(true))
+
+    it('Passes on symbols', () => expect(isScalar(Symbol(123))).toBe(true))
+
+    it('Passes on null', () => expect(isScalar(null)).toBe(true))
+
+    it('Passes on undefined', () => expect(isScalar(undefined)).toBe(true))
+
+    it('Fails on pojo', () => expect(isScalar({})).toBe(false))
+})
diff --git a/test/unit/merge.test.js b/test/unit/utils/merge.test.js
similarity index 100%
rename from test/unit/merge.test.js
rename to test/unit/utils/merge.test.js
diff --git a/test/unit/utils/regexForFormat.test.js b/test/unit/utils/regexForFormat.test.js
new file mode 100644
index 0000000..4e03881
--- /dev/null
+++ b/test/unit/utils/regexForFormat.test.js
@@ -0,0 +1,79 @@
+import regexForFormat from '@/utils/regexForFormat'
+
+describe('regexForFormat', () => {
+  it('Allows MM format with other characters', () => {
+      expect(regexForFormat('abc/MM').test('abc/01')).toBe(true)
+  })
+
+  it('Fails MM format with single digit', () => {
+      expect(regexForFormat('abc/MM').test('abc/1')).toBe(false)
+  })
+
+  it('Allows M format with single digit', () => {
+      expect(regexForFormat('M/abc').test('1/abc')).toBe(true)
+  })
+
+  it('Fails MM format when out of range', () => {
+      expect(regexForFormat('M/abc').test('13/abc')).toBe(false)
+  })
+
+  it('Fails M format when out of range', () => {
+      expect(regexForFormat('M/abc').test('55/abc')).toBe(false)
+  })
+
+  it('Replaces double digits before singles', () => {
+      expect(regexForFormat('MMM').test('313131')).toBe(false)
+  })
+
+  it('Allows DD format with zero digit', () => {
+      expect(regexForFormat('xyz/DD').test('xyz/01')).toBe(true)
+  })
+
+  it('Fails DD format with single digit', () => {
+      expect(regexForFormat('xyz/DD').test('xyz/9')).toBe(false)
+  })
+
+  it('Allows D format with single digit', () => {
+      expect(regexForFormat('xyz/D').test('xyz/9')).toBe(true)
+  })
+
+  it('Fails D format with out of range digit', () => {
+      expect(regexForFormat('xyz/D').test('xyz/92')).toBe(false)
+  })
+
+  it('Fails DD format with out of range digit', () => {
+      expect(regexForFormat('xyz/D').test('xyz/32')).toBe(false)
+  })
+
+  it('Allows YY format with double zeros', () => {
+      expect(regexForFormat('YY').test('00')).toBe(true)
+  })
+
+  it('Fails YY format with four zeros', () => {
+      expect(regexForFormat('YY').test('0000')).toBe(false)
+  })
+
+  it('Allows YYYY format with four zeros', () => {
+      expect(regexForFormat('YYYY').test('0000')).toBe(true)
+  })
+
+  it('Allows MD-YY', () => {
+      expect(regexForFormat('MD-YY').test('12-00')).toBe(true)
+  })
+
+  it('Allows DM-YY', () => {
+      expect(regexForFormat('DM-YY').test('12-00')).toBe(true)
+  })
+
+  it('Allows date like MM/DD/YYYY', () => {
+      expect(regexForFormat('MM/DD/YYYY').test('12/18/1987')).toBe(true)
+  })
+
+  it('Allows date like YYYY-MM-DD', () => {
+      expect(regexForFormat('YYYY-MM-DD').test('1987-01-31')).toBe(true)
+  })
+
+  it('Fails date like YYYY-MM-DD with out of bounds day', () => {
+      expect(regexForFormat('YYYY-MM-DD').test('1987-01-32')).toBe(false)
+  })
+})
diff --git a/test/unit/utils/snakeToCamel.test.js b/test/unit/utils/snakeToCamel.test.js
new file mode 100644
index 0000000..efc0970
--- /dev/null
+++ b/test/unit/utils/snakeToCamel.test.js
@@ -0,0 +1,27 @@
+import snakeToCamel from '@/utils/snakeToCamel'
+
+describe('snakeToCamel', () => {
+    it('Converts underscore separated words to camelCase', () => {
+        expect(snakeToCamel('this_is_snake_case')).toBe('thisIsSnakeCase')
+    })
+
+    it('Converts underscore separated words to camelCase even if they start with a number', () => {
+        expect(snakeToCamel('this_is_snake_case_2nd_example')).toBe('thisIsSnakeCase2ndExample')
+    })
+
+    it('Has no effect on already camelCase words', () => {
+        expect(snakeToCamel('thisIsCamelCase')).toBe('thisIsCamelCase')
+    })
+
+    it('Does not capitalize the first word or strip first underscore if a phrase starts with an underscore', () => {
+        expect(snakeToCamel('_this_starts_with_an_underscore')).toBe('_thisStartsWithAnUnderscore')
+    })
+
+    it('Ignores double underscores anywhere in a word', () => {
+        expect(snakeToCamel('__unlikely__thing__')).toBe('__unlikely__thing__')
+    })
+
+    it('Has no effect hyphenated words', () => {
+        expect(snakeToCamel('not-a-good-name')).toBe('not-a-good-name')
+    })
+})
diff --git a/test/unit/validation/rules.test.js b/test/unit/validation/rules.test.js
index c2414a2..7924702 100644
--- a/test/unit/validation/rules.test.js
+++ b/test/unit/validation/rules.test.js
@@ -1,6 +1,5 @@
 import rules from '@/validation/rules.ts'
 
-
 /**
  * Accepted rule
  */
@@ -143,29 +142,29 @@ describe('between', () => {
  * Confirm
  */
 describe('confirm', () => {
-  it('passes when the values are the same strings', async () => expect(await rules.confirm(
-    { value: 'abc', name: 'password', getFormValues: () => ({ password_confirm: 'abc' }) }
+  it('Passes when the values are the same strings', async () => expect(await rules.confirm(
+    { value: 'abc', name: 'password', formValues: { password_confirm: 'abc' } }
   )).toBe(true))
 
-  it('passes when the values are the same integers', async () => expect(await rules.confirm(
-    { value: 4422132, name: 'xyz', getFormValues: () => ({ xyz_confirm: 4422132 }) }
+  it('Passes when the values are the same integers', async () => expect(await rules.confirm(
+    { value: 4422132, name: 'xyz', formValues: { xyz_confirm: 4422132 } }
   )).toBe(true))
 
-  it('passes when using a custom field', async () => expect(await rules.confirm(
-    { value: 4422132, name: 'name', getFormValues: () => ({ other_field: 4422132 }) },
+  it('Passes when using a custom field', async () => expect(await rules.confirm(
+    { value: 4422132, name: 'name', formValues: { other_field: 4422132 } },
     'other_field'
   )).toBe(true))
 
-  it('passes when using a field ends in _confirm', async () => expect(await rules.confirm(
-    { value: '$ecret', name: 'password_confirm', getFormValues: () => ({ password: '$ecret' }) }
+  it('Passes when using a field ends in _confirm', async () => expect(await rules.confirm(
+    { value: '$ecret', name: 'password_confirm', formValues: { password: '$ecret' } }
   )).toBe(true))
 
-  it('fails when using different strings', async () => expect(await rules.confirm(
-    { value: 'Justin', name: 'name', getFormValues: () => ({ name_confirm: 'Daniel' }) },
+  it('Fails when using different strings', async () => expect(await rules.confirm(
+    { value: 'Justin', name: 'name', formValues: { name_confirm: 'Daniel' } },
   )).toBe(false))
 
-  it('fails when the types are different', async () => expect(await rules.confirm(
-    { value: '1234', name: 'num', getFormValues: () => ({ num_confirm: 1234 }) },
+  it('Fails when the types are different', async () => expect(await rules.confirm(
+    { value: '1234', name: 'num', formValues: { num_confirm: 1234 } },
   )).toBe(false))
 })
 
diff --git a/test/unit/validation/validator.test.js b/test/unit/validation/validator.test.js
index e80cc7e..6445407 100644
--- a/test/unit/validation/validator.test.js
+++ b/test/unit/validation/validator.test.js
@@ -1,36 +1,223 @@
-import { enlarge } from '@/validation/validator.ts'
+import {
+    createValidator,
+    enlarge,
+    parseModifier,
+    processSingleArrayConstraint,
+    processSingleStringConstraint,
+    validate,
+} from '@/validation/validator.ts'
 
-// @TODO: Converting raw rule data to validator
+const isNumberAndInRangeRule = ({ value }, from, to) => !isNaN(value) && value >= from && value <= to
+const isNumberAndInRangeMessage = ({ value }, from, to) => {
+    return isNaN(value) ? 'Value is NaN' : `Value not in range [${from}, ${to}]`
+}
 
-describe('Validator', () => {
-    it ('Enlarges validator groups', () => {
-        expect(enlarge([{
-            validators: [],
-            bail: false,
-        }, {
-            validators: [],
-            bail: false,
-        }, {
-            validators: [],
-            bail: false,
-        }, {
-            validators: [],
-            bail: true,
-        }, {
-            validators: [],
-            bail: false,
-        }, {
-            validators: [],
-            bail: false,
-        }])).toEqual([{
-            validators: [],
-            bail: false,
-        }, {
-            validators: [],
-            bail: true,
-        }, {
-            validators: [],
-            bail: false,
-        }])
+describe('createValidator', () => {
+    it ('Creates correct validator', async () => {
+        const context = { value: 'abc', formValues: {}, name: 'field' }
+        const validate = createValidator(
+            isNumberAndInRangeRule,
+            'rule',
+            [1, 2],
+            isNumberAndInRangeMessage,
+        )
+
+        await expect(validate(context)).toBeInstanceOf(Promise)
+        expect(await validate(context)).toEqual({
+            rule: 'rule',
+            args: [1, 2],
+            context,
+            message: 'Value is NaN',
+        })
+
+        expect(await validate({ ...context, value: 0 })).toEqual({
+            rule: 'rule',
+            args: [1, 2],
+            context: { ...context, value: 0 },
+            message: 'Value not in range [1, 2]',
+        })
+
+        expect(await validate({ ...context, value: 1.5 })).toBeNull()
+    })
+})
+
+describe('enlarge', () => {
+    it ('Merges non-bail validator groups', () => {
+        expect(enlarge([
+            { validators: [], bail: false },
+            { validators: [], bail: false },
+            { validators: [], bail: false },
+        ])).toEqual([
+            { validators: [], bail: false },
+        ])
+    })
+
+    it ('Merges non-bail validator groups, bail groups stayed unmerged', () => {
+        expect(enlarge([
+            { validators: [], bail: false },
+            { validators: [], bail: false },
+            { validators: [], bail: false },
+            { validators: [], bail: true },
+            { validators: [], bail: true },
+            { validators: [], bail: false },
+            { validators: [], bail: false },
+        ])).toEqual([
+            { validators: [], bail: false },
+            { validators: [], bail: true },
+            { validators: [], bail: true },
+            { validators: [], bail: false },
+        ])
+    })
+})
+
+describe('parseModifier', () => {
+    it ('Extracts modifier if present', () => {
+        expect(parseModifier('^required')).toEqual(['required', '^'])
+        expect(parseModifier('required')).toEqual(['required', null])
+        expect(parseModifier('bail')).toEqual(['bail', null])
+        expect(parseModifier('^min_length')).toEqual(['minLength', '^'])
+        expect(parseModifier('min_length')).toEqual(['minLength', null])
+    })
+})
+
+describe('processSingleArrayConstraint', () => {
+    const rules = { isNumberAndInRange: isNumberAndInRangeRule }
+    const messages = { isNumberAndInRange: isNumberAndInRangeMessage }
+
+    it ('Creates validator context if constraint is valid and rule exists', () => {
+        expect(processSingleArrayConstraint(['isNumberAndInRange', 1, 2], rules, messages)).toEqual([
+            expect.any(Function),
+            'isNumberAndInRange',
+            null,
+        ])
+
+        expect(processSingleArrayConstraint(['^is_number_and_in_range', 1, 2], rules, messages)).toEqual([
+            expect.any(Function),
+            'isNumberAndInRange',
+            '^',
+        ])
+    })
+
+    it ('Creates validator context if constraint is validator', () => {
+        const validate = createValidator(
+            isNumberAndInRangeRule,
+            null,
+            [],
+            isNumberAndInRangeMessage,
+        )
+
+        expect(processSingleArrayConstraint([validate], rules, messages)).toEqual([
+            expect.any(Function),
+            null,
+            null,
+        ])
+    })
+
+    it ('Throws error if constraint is valid and rule not exists', () => {
+        expect(() => processSingleArrayConstraint(
+            ['^rule_that_not_exists'],
+            { rule: isNumberAndInRangeRule },
+            { rule: isNumberAndInRangeMessage },
+        )).toThrow('[Formulario] Can\'t create validator for constraint: [\"^rule_that_not_exists\"]')
+    })
+
+    it ('Throws error if constraint is not valid', () => {
+        expect(() => processSingleArrayConstraint(
+            [null],
+            { rule: isNumberAndInRangeRule },
+            { rule: isNumberAndInRangeMessage },
+        )).toThrow('[Formulario]: For array constraint first element must be rule name or Validator function')
+    })
+})
+
+describe('processSingleStringConstraint', () => {
+    const rules = { isNumberAndInRange: isNumberAndInRangeRule }
+    const messages = { isNumberAndInRange: isNumberAndInRangeMessage }
+
+    it ('Creates validator context if constraint is valid and rule exists', () => {
+        expect(processSingleStringConstraint('isNumberAndInRange:1,2', rules, messages)).toEqual([
+            expect.any(Function),
+            'isNumberAndInRange',
+            null,
+        ])
+
+        expect(processSingleStringConstraint('^is_number_and_in_range:1,2', rules, messages)).toEqual([
+            expect.any(Function),
+            'isNumberAndInRange',
+            '^',
+        ])
+    })
+
+    it ('Throws error if constraint is valid and rule not exists', () => {
+        expect(() => processSingleStringConstraint(
+            '^rule_that_not_exists',
+            { rule: isNumberAndInRangeRule },
+            { rule: isNumberAndInRangeMessage },
+        )).toThrow('[Formulario] Can\'t create validator for constraint: ^rule_that_not_exists')
+    })
+})
+
+describe('validate', () => {
+    const isNumber = createValidator(
+        ({ value }) => String(value) !== '' && !isNaN(value),
+        'number',
+        [],
+        () => 'Value is NaN'
+    )
+    const isRequired = createValidator(
+        ({ value }) => value !== undefined && String(value) !== '',
+        'required',
+        [],
+        () => 'Value is required'
+    )
+    const context = { value: '', formValues: {}, name: 'field' }
+
+    it('Applies all rules if no bail', async () => {
+        expect(await validate([
+            [isRequired, 'required', null],
+            [isNumber, 'number', null],
+        ], context)).toEqual([{
+            rule: 'required',
+            args: [],
+            context,
+            message: 'Value is required',
+        }, {
+            rule: 'number',
+            args: [],
+            context,
+            message: 'Value is NaN',
+        }])
+    })
+
+    it('Applies only first rule (bail)', async () => {
+        expect(await validate([
+            [() => {}, 'bail', null],
+            [isRequired, 'required', '^'],
+            [isNumber, 'number', null],
+        ], context)).toEqual([{
+            rule: 'required',
+            args: [],
+            context,
+            message: 'Value is required',
+        }])
+    })
+
+    it('Applies only first rule (bail modifier)', async () => {
+        expect(await validate([
+            [isRequired, 'required', '^'],
+            [isNumber, 'number', null],
+        ], context)).toEqual([{
+            rule: 'required',
+            args: [],
+            context,
+            message: 'Value is required',
+        }])
+    })
+
+    it('No violations on valid context', async () => {
+        expect(await validate([
+            [isRequired, 'required', '^'],
+            [isNumber, 'number', null],
+        ], { ...context, value: 0 })).toEqual([])
     })
 })