I really like the approach Julia is taking. The std libs are their own packages with their own versions. You can then build your own “standard library” by compiling a sysimage that freezes the versions (you can add third party packages as well).

Practically speaking the standard library is just meant as “what’s included in the default sysimage”.

This allows to have different standard libs for different use cases. Think of Linux distributions in a sense. There are already a couple of alternative “stdlibs” out there for different focuses.