pub type TzAllFn = fn(i64) -> Vec<(String, String, i64, bool)>;Expand description
v7.39 (round 502) — every zone the host knows at a UTC instant, as
(name, abbrev, utc_offset_secs, is_dst).
Backs pg_timezone_names. SPG resolved named zones correctly — round
502 measured DST boundaries byte-identical to PG18 — but could not
LIST them, so a client populating a timezone picker got “relation
pg_timezone_names does not exist”. The data was there, only
unlistable. No hook, or a host with no tzdata, yields an empty view
rather than an error: that is what such a host honestly has.