[Issue 18559] std.math.* should stop using `real` overloads by default

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18559

Nicholas Wilson <iamthewilsonator at hotmail.com> changed:

           What    |Removed                     |Added
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--- Comment #2 from Nicholas Wilson <iamthewilsonator at hotmail.com> ---
Please review:

    https://github.com/dlang/phobos/pull/6257
    https://github.com/dlang/dmd/pull/7995
    https://github.com/dlang/druntime/pull/2135

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