of
The digest of an arbitrary flat set of named fields, run through the same canonical rules as ofTerminal: every field is a length-prefixed token, fields are sorted by name so the bytes never depend on the order a map happens to iterate in, and a null value renders as its own distinct absent marker, kept apart from empty text.
This is the codec a durable backend's own comparison digests — a header's, an invocation record's — should run through, ahead of handing the same map to a general-purpose JSON serializer. A serializer's output moves with things that carry no meaning: which Map implementation built the payload, a library version bumping how it renders a number, a config flag turned on for an unrelated reason. Two writes of the same logical state must produce the same digest regardless of any of that, or a correct retry reads as a conflict.
Parameters
The named values to digest, already rendered to the strings that mean what the caller means — this function does no rendering of its own. A null value is encoded as absent, distinct from an empty string.