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

[Mark Shannon]

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

Experiments show that using `stride` just makes the code more complex,
`dk_kind` is sufficient.

We will still need ownership flags for split dicts, though.
A single flag may suffice.

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