Optional ReadonlychangedThe verbs whose line may change what it answers, so a dry run leaves it as written past one of them. Unset, any line may.
ReadonlynameThe name (feed); a dotted name under it (feed.x) is asked of it too.
ReadonlyresolveWhat a name refers to now: its value, null when the session has none yet, or undefined when it is a dotted name this source does not answer (the manifest's parameters and the environment are asked next).
A name the session answers for in
${name}, and the dotted names under it.