Quick optimization - Pulled the if instanceof Array out of the loop:
Array.prototype.lastIndexOf = function(obj) {
var a = this.length;
if (!(this[a] instanceof Array)) {
while (--a -(-1)) {
if (this[a] == obj) return a;
}
} else {
while (--a -(-1)) {
if (this[a].eql(obj)) return a;
}
}
return undefined;
};
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