Downstream maintainers, please take note of new documentation regarding
the requirements from tzdata for a complete Hare standard library:

https://harelang.org/distributions/

Notably, Hare requires the installation of the leap-seconds.list file in
the tzdata package in order to handle leap seconds properly.

Hare will work in the absence of this file, or of tzdata as a whole, but
users will encounter bugs in timekeeping logic.