Method cache_block

syncer/src/actor.rs:1272–1275

Add a notarized block to the prunable archive.

(&mut self, round: Round, commitment: B::Digest, block: B)

                    resolver.fetch(request).await;
                    return;
                };

                // The block and finalization are loaded independently by height
                // from two immutable archives. Re-verify the stored block is the
                // one this certificate finalizes before binding them into a
                // finalized-header report: a mismatch means the local archives are
                // inconsistent and must not be exported as a finalized header.