>> Ordering, consensus, and mutability policy are application concerns outside this series. [1]

Of course, immutable means as-is, but since you're not dealing with ordering etc (that's pretty big), I might as well use existing tech (JSON with a schema) and a policy (simple/naive: hash and compare lowercased data).

[1] From their spec: 2.2.1 Identity and Content Addressing - https://tson.io/2026/32/tson-part1-data/#