Binary "~~" does a smartmatch between its arguments.
Here it's the unary ~~ though (or rather, two unary ~ in a row), because of the commas, the same way that A, -B is a list of two values, not the difference between the list (A,) and the scalar B.

In reply to Re^2: Inchworm vs scalar: on boolean false value by Eily
in thread Inchworm vs scalar: on boolean false value by rsFalse

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