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I'd like to propose a new operator that I'm calling IsParameterDefined. I'd like to use it with an if() in the following way:
if (IsParameterDefined([SomeParameterName]), [SomeParameterName] * 5, 0)
if (IsParameterDefined([Param1]) and IsParameterDefined([Param2]), [Param1] * 5 + [Param2] * 3, 0)