PG 12 bumped the pg_backup_archiver version to 1.14, however this version is not supported in past versions of pg_backup_archiver, resulting in restores to earlier versions not working.
The following steps will reproduce the error: 1. pg_dump on a 12.1 database 2. pg_restore to a postgres db on a version < 12 (in my case 9.6). The error: `pg_restore: [archiver] unsupported version (1.14) in file header`
Questions/observations: 1. Is it expected that pg_dump will produce backwards incompatible dumps? If so, is this documented somewhere? 2. The release notes don't mention this at all as far as I could see. Should they? 3. Should this be a bug? This is the first backwards incompatibility in pg_dump (that I can see) since 9.6
