Re: [csswg-drafts] [css-color] Unnecessary comma in color()

I wouldn't mind alpha written out entirely, that gives a lot of 
clarity, but at the same times I think everyone knows that colors have
 an addition alpha parameter, and ```a``` could be clear enough.

You're right for saturation/shade/etc though, I didn't think this 
through but yes full identifiers make a lot of sense there.

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