[issue29360] Don't check if all keys are strings in _PyStack_AsDict()

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


----------
nosy: +inada.naoki, serhiy.storchaka

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29360>
_______________________________________