Array#==
- returns true if other is the same array
- returns true if corresponding elements are #eql?
- returns false if other is shorter than self
- returns false if other is longer than self
- returns false immediately when sizes of the arrays differ
- handles well recursive arrays
- does not call #to_ary on its argument
- does not call #to_ary on Array subclasses
- ignores array class differences
- compares with an equivalent Array-like object using #to_ary (FAILED - 1)
- compares with an equivalent Array-like object using #to_ary (ERROR - 2)
- returns false if any corresponding elements are not #== (FAILED - 3)
- returns false if any corresponding elements are not #== (ERROR - 4)
- returns true if corresponding elements are #== (FAILED - 5)
- returns true if corresponding elements are #== (ERROR - 6)
- returns false for [NaN] == [NaN] (FAILED - 7)
- returns false for [NaN] == [NaN] (ERROR - 8)