Computes whether two values are approximately equal, admitting a maximum relative difference, and a maximum absolute difference.
First item to compare.
Second item to compare.
Maximum allowable difference relative to rhs.
Maximum absolute difference.
true if the two items are approximately equal under either criterium. If one item is a range, and the other is a single value, then the result is the logical and-ing of calling approxEqual on each element of the ranged item against the single item. If both items are ranges, then approxEqual returns true if and only if the ranges have the same number of elements and if approxEqual evaluates to true for each pair of elements.