[issue20629] Python ctypes BigEndianStructure bitfield assignment misbehavior in Linux

[Yury Selivanov]

Changes by Yury Selivanov <yselivanov.ml at gmail.com>:


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nosy: +amaury.forgeotdarc, belopolsky

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20629>
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