[issue27945] Various segfaults with dict

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This issue is severe, but I don't consider it as release critical for 3.6.0. The patch fixes segfaults, but it can add unneeded overhead, and the dict performance is critical for Python core. The segfaults are not new. I'm trying to minimize the overhead of changes, but this doesn't suffer a haste.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27945>
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