[Issue 20281] CustomFloat is limited to 64 bit

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20281

--- Comment #1 from berni44 <bugzilla at d-ecke.de> ---
Meanwhile I found out, that CustomFloat!(64, 7) works. Probably because of a
hack that treats 64 different.

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