EDNS: Separated "real" RCODEs from error codes.
Although RFC6895 defines error code space to be common for all response errors, one of them is defined twice (BADVERS / BADSIG). Also, only Extended RCODE from OPT RR is interpreted together with RCODE from Header as one number. All other "RCODEs" are separate error codes with dedicated fields (in TSIG or TKEY RRs).
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