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comments of
Pouria
> It's not a bug, because a tuple will become null as a whole if you attempt to construct it with a null field. OK, this makes sense, but would...
> [@CodesInChaos](https://github.com/CodesInChaos) is right that this is the expected behavior, though Then is the way to define exclusive constraint for optional fields by using `field ?? something_not_null` in the constraint...