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userdata
========
reference to a userdata
-----------------------
.. code-block:: cpp
:caption: (light\_)userdata reference
class userdata : public reference;
class light_userdata : public reference;
These type is meant to hold a reference to a (light) userdata from Lua and make it easy to push an existing userdata onto the stack. It is essentially identical to :doc:`reference<reference>` in every way, just with a definitive C++ type.
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