sjkaliski/numbers.js — pull request #29 by swairshah (2012-12-12 13:31:18+00:00)
Title: Change the distance (delta) between two points to calculate a derivative at a point.

Using two points at distance `2*Number.MIN_VALUE` won't work, as `a +/- Number.MIN_VALUE = a`

This commit uses `1e-15` instead of `Number.MIN_VALUE`.

That's the highest precision we can get. without using an external library in javascript (possible option is to use bignum lib)