Naming of `chained(with:)`

[Jumhyn (Frederick Kellison-Linn)]

@xwu

My problem with concatenate and append as names is that precedents in the language strongly imply (to me, at least) that they are functions of type (T, T) -> T , rather than (T, T) -> AnotherCollectionType<T.Element>

Could you specify which precedents? RangeReplaceableColleciton.append(_:) is mutating, so it doesn't return anything, and as noted Publisher.append(_:) returns a different type. Is there something I'm missing?

I ask because I actually have the opposite reaction.To me, it seems like the idiomatic pattern in Sequence methods is to return a transformed type when doing so makes sense (e.g. PrefixSequence, DropWhileSequence).