[issue29816] Get rid of C limitation for shift count in right shift

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Updated PR. Now OverflowError is never raised if the result is representable.

Mark, could you please make a review?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29816>
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