[Python-Dev] PEP 509: Add a private version to dict

[Glenn Linderman]

On 1/20/2016 12:50 PM, Brett Cannon wrote:
>
>     A global (shared between all dicts) unit64 ma_version is actually
>     quite
>     reliable -- if a program does 1,000,000 dict modifications per second,
>     it would take it 600,000 years till wrap-around.
>

But would invalidate everything, instead of just a fraction of things, 
on every update to anything that is monitored...
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