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I suppose this is a relatively minor thing, but being able to have conditionals like "if (0 < x < 20)" has been on my "things I wish just worked" list for awhile.

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I believe you can do this in Python

Yup, you can. Also in Clojure, like this:

(< 1 2 3 4 5 6) => true

How do you do the (IMO common) 0 <= index < length?

This you can't do, unfortunately. Would have to do something stupid like `(< -1 index length)`.

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