[issue23414] seek(count, whence) accepts bogus whence on windows, python2.7

[Steve Dower]

Steve Dower added the comment:

I can't say why 2.7 doesn't use _fseeki64, but 3.5 certainly does. 

Possibly it's a significant change of behaviour that would break backwards compatibility? Making a currently working call raise new exceptions is certainly worth double-checking before introducing into a maintenance release.

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<http://bugs.python.org/issue23414>
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