[docs] [issue11233] clarifying Availability: Unix

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> I like the footnote idea.

Me too.

> I wonder if it would also be worth marking which functions are Posix
> (Availability: posix) and therefore likely to be available on all unix 
> systems.

POSIX has optional APIs, hasn't it?

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nosy: +pitrou

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