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util.format: Escape invalid UTF-8 by passing trough serialization Should prevent invalid UTF-8 from making it into the logs, which can cause trouble with terminals or log viewers or other tools, such as when grep determines that log files are binary.

-- 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;
};