As long as it doesn't adopt an unwritten "never make breaking changes" then that seems fine until a major release.
Probably for another thread: I vouch that there needs to be some kind of official documentation/Swift Lang Manifesto for non-stdlib (or even Foundation) packages on how evolution of APIs can or should take place. I'm not talking about the forum evolution process, but how package APIs can even be pitched to change in the first place.
If there's no standardization, I don't feel confident that all Swift Lang packages will adhere to similar rules that allow API evolution.