[issue45233] Allow split key dictionaries with values owned by other objects.

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

An alternative placement for the flag bits:

Stride bits in the dictkeys.
Ownership bits in the low bits of ma_used.

This would still allow us to remove the version tag at some point.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45233>
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