Corrected PHP type for "decimal" mapping type

"Basic Mapping" documentation says:
"decimal: Type that maps a SQL DECIMAL to a PHP string."

lib/Doctrine/ORM/Tools/EntityGenerator.php

@@ -152,7 +152,7 @@ class EntityGenerator
         Type::SMALLINT      => 'integer',
         Type::TEXT          => 'string',
         Type::BLOB          => 'string',
-        Type::DECIMAL       => 'float',
+        Type::DECIMAL       => 'string',
         Type::JSON_ARRAY    => 'array',
         Type::SIMPLE_ARRAY  => 'array',
     );