validate inputs to is_hidden #429
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inputs must be absolute. Raise ValueError instead of possibly incorrect result when input is invalid
Windows is more complex since it combines root and drive to be absolute cast to list because parents[-1] is new in 3.10
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Both path inputs to
is_hidden()must be absolute, as is documented. But this wasn't checked, which could lead to incorrect results for invalid inputs. These cases are now ValueErrors instead of undefined behavior.closes #423