* HBYTES MASKMAP SYNTAX UNDERRUN value for mask-map entry hex too short
* HBYTES MASKMAP SYNTAX OVERRUN actual mask-map entry hex too short
* HBYTES MASKMAP SYNTAX ORDER actual mask-map is disordered
+ * HBYTES MASKMAP SYNTAX EXCLBITS mask-map has 1-bits outside prefix len
* SOCKADDR AFUNIX LENGTH path for AF_UNIX socket too long
* SOCKADDR SYNTAX IPV4 bad IPv4 socket address &/or port
* SOCKADDR SYNTAX OTHER bad socket addr, couldn't tell what kind