Brett:
------
> It's covered in the language reference where import semantics are
> explained. It isn't explicitly called out in higher-level docs that
> I'm aware of because it only really comes up in edge cases like
> importing in a thread which we actively discourage unless there's a
> compelling reason not to.

When was this change made?  Assuming it is, in fact, a change.  It seems like most of the stdlib could be called in a thread, so the practice of lazily importing a module wholesale might need to be audited and proactively fixed.  Maybe that could be a newcomer's easy(ish) project?