[issue4896] Faster why variable manipulation in ceval.c

[Mark Lawrence]

Mark Lawrence added the comment:

I'm guessing that a patch to ceval.c that's this old wouldn't apply cleanly now.  I'll rework it but only if the changes are highly likely to be accepted.  Given the mixed results previously reported this is not guaranteed.  Opinions please.

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nosy: +BreamoreBoy
type:  -> performance
versions: +Python 3.4, Python 3.5 -Python 3.0, Python 3.1

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