[Issue 15881] approxEqual Ignores maxAbsDiff

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15881

--- Comment #6 from Berni <dlang at croco-puzzle.com> ---
See PR https://github.com/dlang/phobos/pull/7180 for making clearer, what the
function does. Not sure if this might already be accepted as a bugfix.

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