[issue24583] Crash when source set is changed during merging

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM for 3.5.

But 3.6 has other bug. Changeset 637e197be547 looks incorrect to me. key should be increfed before calling PyObject_RichCompareBool() for the same reason as startkey.

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<http://bugs.python.org/issue24583>
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