* Dygraph.compareArrays([[1,2], [3, 4]], [[1,2], [3,4]]) === false.
* @param {!Array.<T>} array1 first array
* @param {!Array.<T>} array2 second array
* Dygraph.compareArrays([[1,2], [3, 4]], [[1,2], [3,4]]) === false.
* @param {!Array.<T>} array1 first array
* @param {!Array.<T>} array2 second array