[issue27863] multiple issues in _elementtree module

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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dependencies:  -various issues due to misuse of PySlice_GetIndicesEx
resolution:  -> fixed
stage: backport needed -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27863>
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