Fix the support for custom parameter types in native queries

The Query class (used for DQL queries) takes care of using the value and
type as is when a type was specified for a parameter instead of going
through the default processing of values.
The NativeQuery class was missing the equivalent check, making the
custom type work only if the default processing of values does not
convert the value to a different one.

src/NativeQuery.php

@@ -50,7 +50,15 @@ protected function _doExecute()
         $types      = [];
 
         foreach ($this->getParameters() as $parameter) {
-            $name  = $parameter->getName();
+            $name = $parameter->getName();
+
+            if ($parameter->typeWasSpecified()) {
+                $parameters[$name] = $parameter->getValue();
+                $types[$name]      = $parameter->getType();
+
+                continue;
+            }
+
             $value = $this->processParameterValue($parameter->getValue());
             $type  = $parameter->getValue() === $value
                 ? $parameter->getType()