Mark Dickinson added the comment:

> I think following patch doesn't introduce undefined behavior.

Agreed. As I recall, the memcpy trick is a fairly standard way around this 
issue, for compilers that are smart enough to compile away the actual memcpy 
call.

> I don't know  wherever the patch can cause performance regression on other 
> platforms or compilers.

Me neither.

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<http://bugs.python.org/issue25823>
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