@toast That's a good principle, but two problems:

1. I think it's very common to do stuff like `from zoneinfo import ZoneFile`, so it should mostly stand on its own.
2. There are other plausible "files" to read from the /usr/share/zoneinfo - zonetab files, leap seconds files, etc. I won't be supporting any of those in the first release, but it still makes sense to make it clear that it's a time zone.