fix pool exhaustion, honor context cancellation and discard stale res… …ponses in client exchange
implement io.ReaderFrom on bufferwriter to avoid 32KB alloc in io.Copy
support empty client dialer
remove unneeded timeout from udp dialer
always set client deadline
add LookupPTR to client resolver
reduce default max conns for udp dialer
fix stats typo
fix padding appender
change DecodeName method