MAINT: Check for overflow in integral np.isin

- Before this fix, if, e.g., int8(-100) and int8(100) are the min and
max, respectively, of ar2, ar2_range would experience an integer
overflow and optimal_parameters would be an invalid value.
``if optimal_parameters:`` would skip the fast integer algorithm
regardless, but warnings would be generated when they are unnecessary.
- np.log10(... + 1) was changed to np.log10(... + 1.0) to avoid further
potential problems from overflow here.
- See https://github.com/numpy/numpy/pull/12065 for discussion.

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