> Some questions in protocol design have no clear-cut answer. Should namespaces be identified via human-readable strings, or via the public keys of some digital signature scheme? That depends entirely on the use-case. To sidestep such questions, the Willow data model is generic over certain choices of parameters. You can instantiate Willow to use strings as the identifiers of namespaces, or you could have it use 256 bit integers, or urls, or iris scans, etc.

> This makes Willow a higher-order protocol: you supply a set of specific choices for its parameters, and in return you get a concrete protocol that you can then use. If different systems instantiate Willow with non-equal parameters, the results will not be interoperable, even though both systems use Willow.

Help me out here - isn't the point of a protocol that two independently developed systems don't have to agree on how to implement the protocol? What value does Willow have if two systems that both purport to be "Willow-compatible" aren't compatible with each another?