Missing description of ED25519-V3 private key format in rend-spec-v3.txt
rend-spec-v3.txt does not specify the format of ED25519-V3 keys in enough detail to make an interoperable implementation. And in particular, the format is different from typical Ed25519 implementations like ed25519/ref in SUPERCOP.
In contrast, the document does specify the format of RSA1024 (v2) keys in enough detail to make an interoperable implementation.