Decodes a serialized message body (the bytes between the version string and the attachments) into its field map. JSON is built in; other serializations (CBOR/MGPK) are injected via ParseOptions.
Decodes a serialized message body (the bytes between the version string and the attachments) into its field map. JSON is built in; other serializations (CBOR/MGPK) are injected via ParseOptions.