Operators.In and Operators.NotIn with not working properly when trying to match the rule setting the condition value as null

[isabelneto]

Description

The problem with the IN and NOT IN operators when trying to match the rule by setting the condition value to null had as its root cause the fact that the default values defined for the array types were an empty array and should be its elementary types.

Fixed defaults for array types to the elementary types (int, decimal, bool and string).

Closes #130

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