pub fn encode_content(codec: u64, payload: &[u8]) -> Vec<u8> ⓘExpand description
Prefix payload with a multicodec varint so the codec is self-describing.
Common codec values: CODEC_IDENTITY (0x00) raw bytes, CODEC_DAG_CBOR (0x71), CODEC_RAW (0x55).
Use CODEC_IDENTITY for plain text — backward-compatible with receivers that treat
content as raw bytes.