Mark Dickinson <dicki...@gmail.com> added the comment:

> Why do you think it isn't safe, Antoine?

It violates C's strict aliasing rules;  Google for 'C strict aliasing' or 'C 
type punning' for more information.  This isn't just a theoretical concern:  
gcc is known to make optimizations based on the assumption that strict aliasing 
isn't violated.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14381>
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