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    \$\begingroup\$ Suggested test case: [1, 1, 1, 2, 2] , so that one element is repeated more than once \$\endgroup\$ Commented Jun 6, 2018 at 11:40
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    \$\begingroup\$ "The array can have multiple types of object." Is this intended to exclude languages that do not allow arrays to have more than one type of object? \$\endgroup\$ Commented Jun 6, 2018 at 13:05
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    \$\begingroup\$ [1.0, 2, 2.0, 1.0] could be interpreted as having only one duplicate: 1.0, if one considers the integer 2 and which might be a non-integer 2.0 to be not equal. Since this is intended to allow for different types. \$\endgroup\$ Commented Jun 6, 2018 at 13:18
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    \$\begingroup\$ "standard equality function" seems hard to define, and will probably lead to different results in different languages. \$\endgroup\$ Commented Jun 6, 2018 at 13:20
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    \$\begingroup\$ Some languages have more than one equality function (for example: Java have Object.equals and ==, JS have === and ==, Python have == and is, and it's 100% opinion-based which one is more "standard"). \$\endgroup\$ Commented Jun 6, 2018 at 14:09