The fallback branch passed as defaultBranch. Always set.
OptionaldefaultWhat the DEFAULT branch means — present only when the caller declared it via the object form of DefaultBranch.
The default branch is chosen by no rule, so no rules[].label describes
it: it is the one branch evidence cannot otherwise name. This field is that
name, and it is recorded on EVERY decision — the run where a rule won as
well as the run that fell through — so a consumer harvesting meanings sees
the same set of branch meanings regardless of which way the data went.
OptionalretryExplicit logical-loop link recorded by addRetryLoop; no key, raw error or provider payload.
The branch selected. Equals
defaultwhen no rule matched.