[cairo] cairo_surface_*_user_data in language bindings

[Christian Biesinger]

Daniel Keep wrote:
> get/set_user_data functions.
> 
> Basically: are these ever *required* for use of the api?  For example,
> does one of the backends ask the programmer to place extra information
> in a surface using these functions?

They're called "user data" because they're for the user... (So the 
answer is "no")

> If the answer is "no", then I can cheat and just implement them using
> hashes and boxes (which also means I don't have to worry about the GC) :)

Note http://cairographics.org/manual/bindings-surfaces.html which says:
"The cairo_surface_set_user_data(), and cairo_surface_get_user_data() 
methods are provided for use in language bindings, and should not be 
directly exposed to applications."
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