code: function getCurrentValue(stream, key) {
  	if (stream._currentEvent && stream._currentEvent.type === key) {
  		return stream._currentEvent.value;
  	} else {
  		var names = keyNames[key];
  		if (!names) {
  			return stream[key];
  		}
  		var VALUE,
  			valueHandler = function(value) {
  				VALUE = value;
  			};
  		stream[names.on](valueHandler);
  		stream[names.off](valueHandler);
  		return VALUE;
  	}
  }
docs: get the current value from a stream