with 0 at the source width pin MapRange outputs MaxFloat.
on the other hand having the same inputs on source min and source max @ Map works fine
hmm. sounds like the more mathematically plausible output; especially as it nicely toggles between -INF and +INF, or DestMin and DestMax depending on the Mapping mode.
Map outputs the more userfriedly Destmin iirc.
what is the more desirable behaviour?