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Chris Tate
cd2b1e2574
A callback loop version emits its loop twice. A loop inside either copy could be versioned again, so a nest of loops that each call a callback built just before them (`const g = adder(i)`) doubled at every level: a three-deep nest was emitted seven times per function. A loop inside a callback version, or the versioned loop itself emitted again for each copy, is no longer versioned, so a loop nest is emitted at most twice. The outer loop keeps its version; inner loops keep their calls as they are.