HEADER_PARTIAL_IV

const HEADER_PARTIAL_IV: 6 = 6

Defined in: packages/filecoin-encryption-envelope/src/cose/constants.ts:51

Partial IV, RFC 9052 §3.1. Forbidden in both content buckets.

Rejected rather than ignored, unlike an unknown label. Partial IV means “rebuild the nonce from this fragment plus shared context”, and iv is always present here — so the pair gives two conflicting instructions for the same nonce with no rule for which wins. Our seven-byte base nonce is not Partial IV reconstruction either; the missing bytes are the chunk index and last-chunk flag, not shared context.

A library decision, not an amendment: docs/tech-spec.md, “Library profile decisions”.