[issue19099] struct.pack fails first time with unicode fmt

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Struct constructor accepts only str and not unicode. But struct.pack() uses caching and it found Struct('B') in the cache (because u'B' and 'B' are equal and have same hash).

I doubt we should fix this. Adding support of Unicode argument is new feature.

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nosy: +mark.dickinson, meador.inge, pitrou, serhiy.storchaka

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<http://bugs.python.org/issue19099>
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