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Chris Tate
883f22ddd6
`for (let lo = a, hi = b; lo < hi; lo++, hi--)` kept both counters as doubles: the counted-loop match takes a single counter, so every `a[lo]`/`a[hi]` converted and tested its index. A loop whose two counters close in on each other by positive literal steps, are not written by the body and index something now stores both as i64: on every body entry both lie between the first start and the second. A start without a proven integer range is tested at run time on a versioned loop, as a counted loop's is.