Both Series.value_counts and Index.value_counts should preserve its name in resulted Series.name? Current behaviors are below:
s = pd.Series([1, 2, 1], name='a')
idx = pd.Index([1, 2, 1], name='a')
result = s.value_counts()
result.name, result.index.name
# (None, None) # should be ('a', None)?
result = idx.value_counts()
result.name, result.index.name
# (None, None) # should be ('a', None)?
didx = pd.date_range('2011-01-01', freq='D', periods=3, name='a')
result = didx.value_counts()
# (None, 'a') # should be ('a', None)?
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