Saxon

In response to a message from Martin Honnen, XSLT3 test case copy-5101 has been created which shows xsl:copy-of with copy-namespaces="no" not working.

https://saxonica.plan.io/boards/3/topics/8011?pn=1

The specific circumstances are that Saxon creates a virtual copy of the original, a wrapper whose methods should reflect the differences from the original including the absence of namespaces. But the NodeInfo.copy() method on the virtual copy (which is invoked by the serialize() function to send the node to a serializer) is simply copying the original, unchanged.