Resulting in:

  up: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(element.parentNode);
    if (typeof expression == 'number') {
      index = expression; expression = false;
    }
    var ancestors = element.ancestors();
    return expression ? Selector.findElement(ancestors, expression,
index) :
      ancestors[index || 0];
  },


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