@doc(PeriodArray.to_timestamp)
def to_timestamp(self, freq=None, how='start') -> DatetimeIndex:
    arr = self._data.to_timestamp(freq, how)
    return DatetimeIndex._simple_new(arr, name=self.name)
@doc(PeriodArray.to_timestamp)
def to_timestamp(self, freq=None, how='start') -> DatetimeIndex:
    arr = self._data.to_timestamp(freq, how)
    return DatetimeIndex._simple_new(arr, name=self.name)