No worries. After I went and perused your Math::Trig::Units
work, it became evident that this wasn't an oversight on your part. Ah well, the links are there for posterity, in case anyone else wants to learn about it.
As for names...approx() works. How about fudge()?
At any rate, at least you know that we're dealing with a psychological tendency, here. With 6 sig figs, for example, 1.99999 is no more special than 1.46793 on a mathematical basis. On a psychological basis it is somewhat irritating because of our preference for nice, neat numbers.