Ensure fileobj mode is str when checking for append mode #4527
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Fixes #4526
If a file-like object with a non-standard interface (eg integer value for
modeproperty) is passed tois_append_mode, it may cause a runtime error or undefined behavior. We can't make assumptions about unknown interfaces, so always returnFalseifmodeisn't a string. Shutting off threading for every non-string implementation is going to have unknown performance impact.