pub const V1_LEGACY_KEYS: &'static [&'static str];Expand description
Top-level TOML keys that legacy schema versions had but V3 either
removed or restructured. Suppresses “unknown key” warnings on V1/V2
configs flowing through migrate_to_current: every key here is
consumed by V1Config::migrate or V2Config::migrate, so it’s
expected on a stale-but-being-migrated config.