As currently specified Math.sign has 5 different return values and, as far as i 
can tell, does not solve the problem I thought it was trying to address. That 
is the difficulty in distinguishing positive and negative numbers without 
having to manually do the divide -> ±Infinity cruft.

What is the rational for this behaviour?

Current Math.sign is a new, and unexpectedly complex API that doesn’t solve the 
common use case.

—Oliver

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