[racket-dev] TR: Five feature/limitation interactions conspire to drive mad

"First, though, I want to make the loop faster. It turns out that this:

  [#{i : Nonnegative-Fixnum} 0]

is enough to turn `<' and `+' into `unsafe-fx<' and `unsafe-fx+', and I
still don't have to annotate `acc' or the loop's return value. Awesome.
Provide and commit."

Posted about this annoyance long back pleading for a special Index
increment operator that TR would optimize.  [#{i: Nonnegative-Fixnum} 0] is
a slick idea.  Thanks for that one.
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