Simplifying sourcecode by using type hints

With the implementation of RFC #0100 (IllegalArgumentException for Type hints) I started migrating code which was manually checking arguments being instances of a certain class to type hints:

For example, this piece of sourcecode from the xml.Node class:

  public function addChild($child) {
    if (!is('Node', $child)) {
      throw new IllegalArgumentException(
        'Parameter child must be an xml.Node (given: '.xp::typeOf($child).')'
      );
    }
    // ...
  }

  public function addChild(Node $child) {
    // ...
  }

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