Any plans to merge `Swift Collections` and `Swift Numerics` into Swift core library?

[scanon (Steve Canon)]

@Jon_Shier

That's fine! The benefit of an open source package is that you can iterate and version as much as you want. There's no need to wait four years to ship something because you want to wait for a particular optimization to be possible. You can ship now and either add to the API later or make a major version release which completely revamps the API. Obviously, doing that too often is disruptive but that would be on the scale of multiple breaking releases in a year, not one in more than four years.

It's our goal to never make breaking changes to these projects. In this regard, they are somewhat atypical for open-source packages (at least modern move-fast semver server packages; in the older open-source world this approach was more common). We will not always achieve that, but in general we want them to meet the same source-stability standards as we have for the stdlib.