std.math using real (issue 18559) is (almost) mostly fixed.

[Nicholas Wilson]

A long-standing issue for D and math. The main thing missing is 
the log family of functions (and therefore inverse hyperbolic 
trig functions). If anybody wants to do those that would be great!

https://github.com/dlang/phobos/pull/7463

Its currently blocked by a couple of downstream PRs, so if you 
have access to those repos please pull.