Antoine Pitrou <pit...@free.fr> added the comment:

With PEP 393 unicode objects can have several representations, which makes it 
unlikely that *really* constant-timing functions can be devised.

However, a C version could provide some guarantees, by raising an error if the 
passed unicode strings use a different representation from each other.

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nosy: +pitrou

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<http://bugs.python.org/issue14955>
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