Workaround for namespace definition removal

[ThomasWeinert]

DOMElement::setAttributeNS() seems to remove used namespace definitions if the attribute name equals the namespace prefix.

$document = new DOMDocument();
$document->appendChild($document->createElement('foo'));
$document->documentElement->setAttributeNS('urn:bar', 'bar:bar', '42');
$document->documentElement->setAttributeNS('urn:bar', 'bar:foobar', '42');
$document->documentElement->removeAttributeNS('urn:bar', 'bar');
echo $document->saveXML();

Additoinally using the XML namespaces URI seems no to remove namespace definitions

$document = new DOMDocument();
$document->appendChild($document->createElement('foo'));
$document->documentElement->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:bar', 'urn:example');
$document->documentElement->removeAttributeNS('http://www.w3.org/2000/xmlns/', 'bar');
echo $document->saveXML();

FluentDOM should contain tests and implement a workround.