When processing arrays, can't distinguish between numerical and string item which has the "same" value

[passionwdy]

example
findLongestMatch(1234, '1234') will return [0, 0, 1].

I guess the main reason is some object keys do not contain type info. For example in the SequenceMatcher.prototype._chainB function when generate b2j, elt should add the result of typeof elt. Like this elt = typeof elt + elt.