Negative/Negation Sign

[Rebecca Bettencourt]

Smalltalk also uses a distinct symbol for unary minus. I mapped it to
U+207B, because that's what it looks like, and they have the same semantics.

I would do the same for the TI-89 character set, because I had a TI-89, and
I remember that's what it looks like, and they have the same semantics.
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