On Tuesday 20 September 2016 12:44:04 Olivier Goffart wrote:
> > It is easy to forget registering comparator functions and currently Qt
> > doesn't help in debugging such issues. So I wonder if QVariant should
> > forbid comparison of custom types without having a comparator function
> > registered.
> That's a source incompatible change.

But one of the type we allow (fixes still compile and work with older Qt), in 
line with adding `explicit` to ctors that miss it.


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