[issue30281] set stop default to -PY_SSIZE_T_MAX-1 in PySlice_Unpack

[Xiang Zhang]

Changes by Xiang Zhang <angwerzx at 126.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30281>
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