If !in is inconsistent because of bool/pointer, then so is !

[bearophile]

downs:
> Furthermore, many newcomers expect !in to work because it is intuitive. Violating such user expectations should be avoided wherever possible.

If the pressure coming from such silly limits/warts gets large enough, LDC may start fixing them independently from DMD (I don't know what LDC developers think about this idea).

Bye,
bearophile