I suspect this depends on whether or not the necessary characters are
there when the deleteCharacters operation comes along. If they are,
then you can safely normalize out
deleteCharacters("def")
characters("def")
into retain(3). If they aren't, then you have a problem.
This is visible in Tad's examples: in "b . c . inv(c)" the characters
aren't there (or at least not necessarily there), and the result is
not normalized. Whereas in "a . c. inv(c)", a conclusively provides
the necessary characters, and the result is normalized.
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