Fix potential test case typo in test_zadd_gt_lt

[Andrew-Chen-Wang]

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Description of change

There may be a typo in the tests where an invalid keyword argument is passed

[Andrew-Chen-Wang]

I'm also curious why the lt and gt args have integers in the test cases? I thought they were simple booleans?

[chayim]

Thanks for catching this @Andrew-Chen-Wang ! You're absolutely right.