Sorry for spamming,
but i found a way to further improve the method by making the
detection of "expression is index" a shortcut.
up: function(element, expression, index) {
element = $(element);
if (arguments.length == 1) return $(element.parentNode);
var ancestors = element.ancestors();
if (typeof expression == 'number') return ancestors[expression];
return expression ? Selector.findElement(ancestors, expression,
index) :
ancestors[index || 0];
},
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