[dist4]message_header // num_bytes [u4]0 // version [u4]0 // interface ID [u4]18 // name [u4]0 // flags [u4]0 // padding [anchr]message_header [dist4]method18_params // num_bytes [u4]0 // version [u4]0 // param0: Size 0 indicating the inlined union is null. [u4]0 // param0: Tag field ignored. [u8]0 // param0: Payload field ignored. [anchr]method18_params