'Returns an *RGBA* tuple of four floats from 0-1.
For acceptable values of *arg*, see :meth:`to_rgb`.
In addition, if *arg* is "none" (case-insensitive),
then (0,0,0,0) will be returned.
If *arg* is an *RGBA* sequence and *alpha* is not *None*,
*alpha* will replace the original *A*.'

@staticmethod
def to_rgba(arg, alpha=None):

    return to_rgba(arg, alpha)
