{{alias}}( idtype1, idtype2, odtype, policy )
    Resolves the casting data type for an input ndarray provided to a binary
    function.

    Parameters
    ----------
    idtype1: string
        Input ndarray data type.

    idtype2: string
        Additional input ndarray data type.

    odtype: string
        Output ndarray data type.

    policy: string
        Input ndarray casting data type policy. If `policy` is a data type, the
        function returns the `policy` value.

    Returns
    -------
    out: string
        Input ndarray casting data type.

    Examples
    --------
    > var out = {{alias}}( 'float64', 'float64', 'float64', 'none' )
    'float64'

    See Also
    --------