https://issues.dlang.org/show_bug.cgi?id=10448 --- Comment #11 from Vladimir Panteleev <dlang-bugzilla at thecybershadow.net> --- FWIW, after https://github.com/dlang/phobos/pull/2198, the output changes to: nanF 0.00000F 0.00000F nanF Still looks broken, but in a different way. --