const IDENTITY: &[(&[&str], &[&str])];Expand description
Identity candidates, most specific first. A candidate matches when every one of its required keys is present; its optional keys join the hash when they are. First match wins.
This list is deliberately fixed rather than configurable: an identity rule that two operators set differently is an identity rule that does not identify anything. See principle 3 in docs/architecture.md section 1.