[issue2997] PyNumberMethods has left-over fields in Py3

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Let me quote a comment from GvR about the similar issue1185:

"""
Can you redo the patch while keeping the slot *position* (though not the
name or type)?  The wasted space is minimal (4-8 bytes per type or class
object) and it means a lot for third party code if the positional struct
initialization never breaks due to insertion or removal of a slot. 
Since everyone has a zero here anyway, I propose to name the slot
nb_reserved and make its type int.
"""

OTOH, it's python 3.0, and we are allowed to break things...

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue2997>
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