Improve _checkTypehint()

* Add type-declaration to $reason parameter
* Avoid double call of ->getClass()

Author: jsor

src/functions.php

@@ -324,12 +324,8 @@ function fatalError($error)
 /**
  * @internal
  */
-function _checkTypehint(callable $callback, $object)
+function _checkTypehint(callable $callback, \Throwable $reason)
 {
-    if (!\is_object($object)) {
-        return true;
-    }
-
     if (\is_array($callback)) {
         $callbackReflection = new \ReflectionMethod($callback[0], $callback[1]);
     } elseif (\is_object($callback) && !$callback instanceof \Closure) {
@@ -344,11 +340,11 @@ function _checkTypehint(callable $callback, $object)
         return true;
     }
 
-    $expectedException = $parameters[0];
+    $expectedClass = $parameters[0]->getClass();
 
-    if (!$expectedException->getClass()) {
+    if (!$expectedClass) {
         return true;
     }
 
-    return $expectedException->getClass()->isInstance($object);
+    return $expectedClass->isInstance($reason);
 }