STINNER Victor <victor.stin...@gmail.com> added the comment:

> I don't think the change had any effect on memory consumption: because of 
> alignment, padding is inserted either way to fill the flags to four (32-bit) 
> or eight bytes. So with the bit field, there were 7 bytes of padding on 
> 64-bit systems, and now there are only 6 bytes of padding.

Oh, interesting information. I forgot the alignment thing.

> Yes, Visual C also supports the same extension. See the "Microsoft specific" 
> section in
> http://msdn.microsoft.com/en-us/library/yszfawxh(v=vs.80).aspx

Oh, what is the "C" language nowadays?...

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<http://bugs.python.org/issue14993>
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