[issue23591] Add Flags and IntFlags

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I don't think this is a problem. For now os.O_WRONLY is os.O_WRONLY, but os.O_WRONLY|os.O_CREAT|os.O_TRUNC is not os.O_WRONLY|os.O_CREAT|os.O_TRUNC. There is an exponential number of combinations (actually infinite number if count not named bits) and you shouldn't use identity check for flags.

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<http://bugs.python.org/issue23591>
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