[Issue 17418] opCmp return value unclear

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=17418

berni44 <bugzilla at d-ecke.de> changed:

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--- Comment #2 from berni44 <bugzilla at d-ecke.de> ---
Meanwhile the definition [1] defines three cases returning an int (<, ==, >),
but as far as I know, it's also possible to have reals as return types and in
this cases NaN is a fourth possible result. 

[1] https://dlang.org/phobos/object.html#.Object.opCmp

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