[issue11549] Rewrite peephole to work on AST

[Eugene Toder]

Eugene Toder <eltoder at gmail.com> added the comment:

> I don't think it can:
That already doesn't work in dict and set (eq not consistent with hash), I don't think it's a big problem if that stops working in some other cases. Anyway, I said "theoretically" -- maybe after some conservative type inference.

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