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    split

    Compatibility note: in older versions of JS, when String.split() is given an undefined first argument, it converted it to the string 'undefined', instead of defaulting to ','.

    "1undefined2undefined3".split(undefined) --> ["1","2","3"]    // not ECMA compliant
    

    I'm not sure which version of JS this changed in. See also my corresponding note in Array.join()

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