reverse of _ensure_data

    Parameters
    ----------
    values : ndarray
    dtype : pandas_dtype
    original : ndarray-like

    Returns
    -------
    Index for extension types, otherwise ndarray casted to dtype

def _reconstruct_data(values, dtype, original):
    """
    reverse of _ensure_data

    Parameters
    ----------
    values : ndarray
    dtype : pandas_dtype
    original : ndarray-like

    Returns
    -------
    Index for extension types, otherwise ndarray casted to dtype
    """
    from pandas import Index
    if is_extension_array_dtype(dtype):
        values = dtype.construct_array_type()._from_sequence(values)
    elif is_datetime64tz_dtype(dtype) or is_period_dtype(dtype):
        values = Index(original)._shallow_copy(values, name=None)
    elif is_bool_dtype(dtype):
        values = values.astype(dtype)

        # we only support object dtypes bool Index
        if isinstance(original, Index):
            values = values.astype(object)
    elif dtype is not None:
        values = values.astype(dtype)

    return values