[issue26058] Add dict.__version__ read-only property

[STINNER Victor]

STINNER Victor added the comment:

> I don't understand this:
>> The version 0 is reserved for "missing key"

Oh, ignore it, it's an outdated comment :-) Dictionary version is initialized to 0, it's not more "reserved".

FYI I added the comment in my first implementation which also added a version to dictionary *entries*.

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<http://bugs.python.org/issue26058>
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