Resolver::autowireArgument() fixed handling of new-initializer with typehint [Closes #302]

Author: dg

src/DI/Resolver.php

@@ -642,7 +642,7 @@ private static function autowireArgument(\ReflectionParameter $parameter, callab
 				throw new ServiceCreationException("{$e->getMessage()} (required by $desc)", 0, $e);
 			}
 
-			if ($res !== null || $parameter->allowsNull()) {
+			if ($res !== null || $parameter->allowsNull() || $parameter->isOptional()) {
 				return $res;
 			} elseif (class_exists($class) || interface_exists($class)) {
 				throw new ServiceCreationException(sprintf(

tests/DI/Resolver.autowireArguments.81.phpt

@@ -41,3 +41,13 @@ Assert::same(
 		function () {}
 	),
 );
+
+// object as default with typehint
+Assert::same(
+	['b' => 10],
+	Resolver::autowireArguments(
+		new ReflectionFunction(function (stdClass $a = new stdClass, $b = null) {}),
+		[1 => 10],
+		function () {}
+	),
+);