pub fn remove_user_kv(key: &str) -> Result<bool, ConfigError>Expand description
Remove a single user-scoped key from $XDG_CONFIG_HOME/mkit/config,
mirroring write_user_kv’s read-modify-write-atomically shape but
dropping the matching line instead of replacing it. Returns true
iff a matching line was found and removed (a no-op unset — the key
was already absent — returns false rather than erroring, so
mkit config --unset on an already-unset key is idempotent).