SchemaVersion

The current version of a persisted JSON shape, with the migrations that bring older versions up to it. A state key's value, a state key's update and a node's input each carry one; their stable codec id is the owner's id with this version (<keyId>@<version>), and every encoded value records the version it was written with (see VersionedJson).

A step keyed n migrates JSON written at version n to version n + 1. Steps are plain functions of the compiled graph, never persisted.