It's inferring it from the array literal in the first place, but it is a different kind of inference from the original one. But I think that's what the question

It's inferring it from the array literal in the first place, but it is a different kind of inference from the original one. But I think that's what the question was asking for: > What's a sane/legit use case of such inferring in general? Depends how you interpret "such inferring"