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2
was good, thanks.4
needs a tad more thought imho, returning animpl T
does have its place, because it makes changing the return type of the function a non-breaking change.Number 4 is only about not returning
impl Into
and instead just returningT
.Hmm, right. I think it still might be warranted in niche cases, but trying to think of such a case made it pretty protracted in my head… maybe when functions can also be called for side effects, and the
into
conversion is costly and the caller might not care about the return value?