Ah my mistake, I linked to the docs for `pg_dump` (which has long had the `format` option) rather than `pg_dumpall` (which lacks it). Before Postgres 18 was re

Ah my mistake, I linked to the docs for `pg_dump` (which has long had the `format` option) rather than `pg_dumpall` (which lacks it). Before Postgres 18 was released, the docs listed `format` as an option for `pg_dumpall` in the upcoming version 18 (e.g. Wayback Machine from Jun 2025 https://web.archive.org/web/20250624230110/https://www.postgresql.org/docs/18/app-pg-dumpall.html#:~:text=%2D%2Dformat%20is%20plain-,%2DF%20format,the%20oid%20of%20the%20database.,-Note:%20see%20pg_dump https://web.archive.org/web/20250624230110/https://www.postg... ). The relevant commit is from Apr 2025 (see link #0 in my original comment). But now all mention has been scrubbed, even from the Devel branch docs.