Integral types that define opCmp, opEquals

[Henning Hasemann]

> IIRC 'is' tests if a _type_ is valid. Try something like is(typeof(i < i)).

Works quite well, only thing is that
it yields true for everything that is derived from object,
but these indeed *have* defined opCmp so I guess
there is no real way to find out if the writer of
a class things this class' objects should be comparable
to themselves.

Henning

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