diff --git a/src/Language/AST/Value.php b/src/Language/AST/Value.php
index 9f1ffb7..dd83bf4 100644
--- a/src/Language/AST/Value.php
+++ b/src/Language/AST/Value.php
@@ -1,16 +1,17 @@
 <?php
 namespace GraphQL\Language\AST;
 
-interface Value
-{
 /**
 export type Value = Variable
-                    | IntValue
-                    | FloatValue
-                    | StringValue
-                    | BooleanValue
-                    | EnumValue
-                    | ListValue
-                    | ObjectValue
+| IntValue
+| FloatValue
+| StringValue
+| BooleanValue
+| EnumValue
+| ListValue
+| ObjectValue
  */
+interface Value
+{
+
 }
diff --git a/src/Type/Definition/EnumType.php b/src/Type/Definition/EnumType.php
index daf1fe0..8bc73c6 100644
--- a/src/Type/Definition/EnumType.php
+++ b/src/Type/Definition/EnumType.php
@@ -11,12 +11,12 @@ use GraphQL\Utils;
 class EnumType extends Type implements InputType, OutputType, LeafType
 {
     /**
-     * @var array<EnumValueDefinition>
+     * @var EnumValueDefinition[]
      */
     private $values;
 
     /**
-     * @var \ArrayObject<mixed, EnumValueDefinition>
+     * @var Utils\MixedStore<mixed, EnumValueDefinition>
      */
     private $valueLookup;
 
@@ -44,11 +44,13 @@ class EnumType extends Type implements InputType, OutputType, LeafType
 
         if (!empty($config['values'])) {
             foreach ($config['values'] as $name => $value) {
-
-                if (is_string($value) && is_int($name)) {
-                    $value = ['name' => $value, 'value' => $value];
+                if (!is_array($value)) {
+                    if (is_string($name)) {
+                        $value = ['name' => $name, 'value' => $value];
+                    } else if (is_int($name) && is_string($value)) {
+                        $value = ['name' => $value, 'value' => $value];
+                    }
                 }
-
                 // value will be equal to name only if 'value'  is not set in definition
                 $this->values[] = new EnumValueDefinition($value + ['name' => $name, 'value' => $name]);
             }
diff --git a/src/Type/Definition/ObjectType.php b/src/Type/Definition/ObjectType.php
index 80c43e5..7d84199 100644
--- a/src/Type/Definition/ObjectType.php
+++ b/src/Type/Definition/ObjectType.php
@@ -93,7 +93,7 @@ class ObjectType extends Type implements OutputType, CompositeType
                 Config::INTERFACE_TYPE,
                 Config::MAYBE_THUNK
             ),
-            'isTypeOf' => Config::CALLBACK, // ($value, ResolveInfo $info) => boolean
+            'isTypeOf' => Config::CALLBACK, // ($value, $context, ResolveInfo $info) => boolean
             'resolveField' => Config::CALLBACK
         ]);
 
@@ -156,6 +156,7 @@ class ObjectType extends Type implements OutputType, CompositeType
     /**
      * @param $value
      * @param $context
+     * @param ResolveInfo $info
      * @return bool|null
      */
     public function isTypeOf($value, $context, ResolveInfo $info)
diff --git a/src/Type/Definition/ScalarType.php b/src/Type/Definition/ScalarType.php
index e327910..5db0bf0 100644
--- a/src/Type/Definition/ScalarType.php
+++ b/src/Type/Definition/ScalarType.php
@@ -50,8 +50,8 @@ abstract class ScalarType extends Type implements OutputType, InputType, LeafTyp
     /**
      * Parses an externally provided literal value to use as an input
      *
-     * @param $valueAST
+     * @param \GraphQL\Language\AST\Value $valueAST
      * @return mixed
      */
-    abstract public function parseLiteral(/* GraphQL\Language\AST\Value */$valueAST);
+    abstract public function parseLiteral($valueAST);
 }