There is namespace support like:

.. php:namespace:: Foo\Bar

.. php:class:: X

which renders class Foo\Bar\X correctly.

but

.. php:namespace:: Foo\Bar

.. php:class:: \Foo\Data\Y

support is broken. I would expect Foo\Bar ignored as the class name is fully qualified, ie. class Foo\Data\Y rendered.

The same for traits, references...