Can the Swift versions support policy be changed from supporting the 3 most recent versions of Swift to support building on all current Apple-supported macOS major versions?
Currently, that's 3 major versions of macOS; the project would need to support the newest Swift that can run on the newest Xcode that can run on the newest minor & patch version of the oldest current Apple-supported macOS version, which is currently Swift 5.9 (see this Apple documentation).
This allows developers to build on any current Apple-supported macOS version, and moreover allows a Homebrew formula to work for all current Apple-supported macOS versions. Homebrew requires that a formula can build on the target major macOS version, and they don't have any plans to provide cross build functionality from one macOS version to another.
That would currently only require supporting one older version of Swift (5.9+ instead of 5.10+), but would greatly simplify project distribution & development, especially for open source projects.
It would be useful to change this policy for all Apple / Swift lang projects, not just for Atomics.
Thanks.