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mod_external_services: Warn about missing recommended fields These are RECOMMENDED in XEP-0215 so most likely a mistake if they are left out. Of the two REQUIRED fields, 'host' falls back to module.host and 'type' rejects the whole item.

-- 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;
};