[issue26219] implement per-opcode cache in ceval

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

It's up to the release manager, but personally it feels like you're pushing
too hard. Since you've done that frequently in the past I think we should
help you by declining your request. 3.8 is right around the corner (on a
Python release timescale) and this will give people a nice incentive to
upgrade. Subsequent betas exist to stabilize the release, not to put in
more new stuff.

Now maybe we'll need to come up with a different way to do releases, but
that's more a python-dev discussion.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26219>
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