[Haskell-cafe] Recursive timezone-loading function

[David Thomas]

https://github.com/dlthomas/tzcache

A small bit of code, but seems likely to be useful enough that I figured I
should share.

I've a few notes/questions:

1) Does this already exist somewhere I missed?

2) It seems silly to make this its own library - any suggestions where it
could be added?

3) Is the traverse-a-directory-and-populate-a-map pattern one worth
abstracting?  If so, where should that go?

4) Presently, it's a static cache entirely pre-loaded.  This seems fine, as
it's not a terribly huge amount of data, but it's worth noting.

5) Any comments on the code generally?  Improvements?  Complaints?

Thanks,

- David
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