Honestly, it sounds like the most reasonable behavior here would be to _only_ support "Z" (optionally with "+<offset>") and none of the 3-letter codes. Unfortun

Honestly, it sounds like the most reasonable behavior here would be to _only_ support "Z" (optionally with "+<offset>") and none of the 3-letter codes. Unfortunately it would probably a breaking change to remove support for the existing codes, so it wouldn't happen.