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util.prosodyctl.check: Fix A/AAAA check for proxy65 and http When there are no records to return the return value from dns.lookup() might be nil or might be a table containing zero records, depending on which DNS library is used

-- Only the operators needed by net.websocket.frames are provided at this point
return {
	band   = function (a, b) return a & b end;
	bor    = function (a, b) return a | b end;
	bxor   = function (a, b) return a ~ b end;
};