Always use loose type checking for object check decision

The decision whether to check something as an object should always be
made loosely, regardless of whether Constraint::CHECK_MODE_TYPE_CAST is
set. Loosely checking here does not actually cast anything, but ensures
that subvalues are still properly processed in assoc mode even when type
casting is disabled.

Author: erayd

src/JsonSchema/Constraints/UndefinedConstraint.php

@@ -11,6 +11,7 @@
 
 use JsonSchema\Uri\UriResolver;
 use JsonSchema\Entity\JsonPointer;
+use JsonSchema\Constraints\TypeCheck\LooseTypeCheck;
 
 /**
  * The UndefinedConstraint Constraints
@@ -57,7 +58,7 @@ public function validateTypes(&$value, $schema = null, JsonPointer $path, $i = n
         }
 
         // check object
-        if ($this->getTypeCheck()->isObject($value)) {
+        if (LooseTypeCheck::isObject($value)) {
             $this->checkObject(
                 $value,
                 isset($schema->properties) ? $this->factory->getSchemaStorage()->resolveRefSchema($schema->properties) : $schema,