[timjver]

The renaming of flatten to joined was a last-minute proposal, and it wasn't even implemented by someone of Swift's core team. I don't think it distracted the team much at all.

Also, breaking changes such as this one were a lot easier to make in Swift 3 than in a later version.

[st3v3r]

If they're still making breaking changes like this, then why have they declared version 1? They should still be on version 0.x

[SamReidHughes]

Why?