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1.Comparing Arrays
2.eql? returns true if the objects are the same or if their content is the same. arrays is with <=> (spaceship operator).
4.Comparison: Returns an integer -1,0, or +1, if this array is less than, equal to, or greater than other_array.
5.Equality: equal if they contain the same number of elements and if each element is equal to the corresponding element in the other array.