color:linear_rgba()
Since: 20220807-113146-c2fee766
Returns a tuple of the colors converted to linear RGBA and
expressed as floating point numbers in the range 0.0-1.0:
> r, g, b, a = wezterm.color.parse("purple"):linear_rgba()
> print(r, g, b, a)
07:32:17.734 INFO logging > lua: 0.2158605307340622 0 0.2158605307340622 1