BUG: Replaced default parameter [] by None and made some simplifications #9
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Unexpected behavior might have occurred while running json_are_same several times in a row with different lists.
When using [] as the default value of a list and you run it several times, then the list might look different as you expected it to look like. (see here http://docs.python-guide.org/en/latest/writing/gotchas/#mutable-default-arguments)