Sure, color and indentation are optional, but even without those, I don't see that a comma in the above syntax helps much, even on a 80x24 monochrome display. If you want separators, note that the labels which end with a colon are just that, and just as clear as commas. There is a reason why you tried to obfuscate that in your example by placing the colons not with the labels, but the arguments.
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