docs: function(message) {
  		var identifier = _makeIdentifier(message);
  		if (typeof _filter[identifier] !== 'undefined' && _filter[identifier] < ((+new Date()) + 10 * 60000)) {
  			console.error('duplicated error', identifier, message);
  			return _filter[identifier];
  		}
  
  		_filter[identifier] = +new Date();
  		return false;
  	}