std.math.approxEqual, 'maxRelDiff' parameter?

[bearophile]

ref2401:

> What does means 'maxRelDiff' parameter?
> I looked at the source code of this method and I still didn't 
> get it.
>
> return fabs((lhs - rhs) / rhs) <= maxRelDiff
> || maxAbsDiff != 0 && fabs(lhs - rhs) <= maxAbsDiff;
>
> In what cases can I use this parameter?

Maybe you want to use std.math.feqrel instead.

Bye,
bearophile