[Python-ideas] RFC: PEP: Add dict.__version__

[Barry Warsaw]

On Jan 12, 2016, at 01:37 PM, Nick Coghlan wrote:

>The question then becomes "Are we willing to let CPython cede high
>memory pressure environments to more specialised Python variants?",
>and I think the answer to that is "yes".

I'm not so willing to cede that space to alternative implementations, at least
not yet.  If this suite of ideas yields *significant* performance
improvements, it might be a worthwhile trade-off.  But I'm not in favor of
adding dict.__version__ in the hopes that we'll see that improvement; I think
we need proof.

That makes me think that 1) it should not be exposed to Python yet; 2) it
should be conditionally compiled in, and not by default.  This would allow
experimentation without committing us to long-term maintenance or an
across-the-board increase in memory pressures for speculative gains.

Cheers,
-Barry
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