[issue30427] isinstance checks in os.path.normcase redundant with os.fspath

[Wolfgang Maier]

Wolfgang Maier added the comment:

Just created a PR for this, which eliminates the redundancy. This also changes the error message (making it less specific), but not the type of a raised exception.
If you think that the error message deserves to be preserved that could, of course, be done too.

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type:  -> performance

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<http://bugs.python.org/issue30427>
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