[issue12797] io.FileIO and io.open should support openat

[Charles-François Natali]

Charles-François Natali <neologix at free.fr> added the comment:

> Thanks. Although, on second thought, I'm not sure whether Amaury's 
> idea (allowing a custom opener) is not better... Thoughts?

+1.
This would also address issues #12760 and #12105.

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<http://bugs.python.org/issue12797>
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