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ulp (clj)
(source)function
(ulp d)
Returns the size of an ulp (unit in last place) for d.
If d is ##NaN => ##NaN
If d is ##Inf or ##-Inf => ##Inf
If d is zero => Double/MIN_VALUE
If d is +/- Double/MAX_VALUE => 2^971
See: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#ulp-double-