__inverse__ to Index.Related to #7979
Because Index is no more the subclass of np.array, Index.duplicated returns Index with dtype=object. And Index don't accepts logical not.
idx = pd.Index([1, 2, 1, 3])
idx.duplicated()
# Index([False, False, True, False], dtype='object')
~idx.duplicated()
# TypeError: bad operand type for unary ~: 'Index'
As a result, it is impossible to drop data which have duplicated index using expression like df[~df.index.duplicated()]. This expression was worked at the timing of #7979.
Does Index.duplicated should return np.array with dtype=bool? Or Index should accept logical not?
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