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MUC: Don't unconditionally broadcast presence with role="none" Detailed explanation in de607875d4bd. A presence with role="none" (which is always type="unavailable") should only be broadcast if available presence was previously broadcast for that occupant.

-- 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;
};