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Not to be excessively glib, but I can't resist pointing out that children successfully comprehend this notation daily, it's called "fill in the blank."

It's not a matter of it not being comprehensible once you know what's going on; it's a matter of consistency with the rest of the language. Everywhere else, each symbol refers to one and only one value within a given lexical context. Breaking from that expectation would require some compelling benefits.

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