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Thu Apr 14 18:22:04 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-April/144179.html

On Thu, 14 Apr 2016 at 15:14 Victor Stinner <victor.stinner at gmail.com>
wrote:

> 2016-04-14 23:29 GMT+02:00 Barry Warsaw <barry at python.org>:
> > I can see why you might want a global version number, but not doing so
> would
> > eliminate an implicit reliance on the GIL, or in a GIL-less
> implementation
> > <wink> a lock around incrementing the global version number.
>
> It's not like the builtin dict type is going to become GIL-free... So
> I think that it's ok to use a global version.
>
> A very few know that, but the GIL has some advantages sometimes...
>

And even if it was GIL-free you do run the risk of two dicts ending up at
the same version # by simply mutating the same number of times if the
counters were per-dict instead of process-wide.
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[Python-Dev] RFC: PEP 509: Add a private version to dict