Chasing for a weird bug in code, I found out that map returns inf if low1 and high1 have the same value. From looking at the source code (and many might guess it without looking at it), it's clear why, as it ends up dividing by zero.

I know the function is useless if these values are the same, and adding a conditional to that function is probably unnecessary overhead, but it could happen with arbitrary variables, so maybe there should be some warning about that in the reference, so if that could happen, folks would know they'd have to that function in a conditional.

note: I haven't made the jump to 1.0 yet, and I looked into beta code, so ignore this post if there were design changes on the map function.