vecdraw treats blackness as if it was transparency

[Dunbaratu]

When I was just testing HSV colors I found a bug I thought was in HSV but is actually in vecdraw itself and also manifests with RGB colors in vecdraw too.

Try this:

set testcolor to rgb(0,0,0). // this is *supposed* to mean opaque black.

set vd to vecdraw(v(0,0,0), v(0,5,0), testcolor, "test", 1, true).

And you get a vector that is transparent rather than *black" like it should be.
If you fiddle with the brightness of the color, you find that it's actually altering the alpha value, not the darkness. For example, if you try a grey color like rgb(0.5,0.5,0.5) then what you really get is white but semi-transparent, rather than grey.