See also: Why does the first $c evaluate to the incremented value in [$c, $c += $_] ?

I read you as follows:

• Functions take an argument list, where the comma is an argument separator. The argument separator, however, is the same as comma operator, therefore the evaluation order is documented and guaranteed.
• Functions take a generic list as arguments, and that is all there is to it. No other rules, no specifications to consider.

Please correct me if I misread you. Also, it wouldn't hurt to provide some citations or pointers to materials where the conceptual design is laid out.

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