Function isCloseTo

Example

import * as N from "flurp/number";

const isVeryNearFive = N.isCloseTo(5);
isVeryNearFive(5 + 1e-16);     // true
isVeryNearFive(5 - 1e-16);     // true
isVeryNearFive(5 + 1e-14);     // false

const isSortOfNearFive = N.isCloseTo(5, 0.1);
isSortOfNearFive(5.08);        // true