Variable is less than, equal to, or greater than the second.
@param resolver1 Resolver that is used to evalute the first Variable.
@param resolver2 Resolver that is used to evalute the second Variable.
@return a negative integer, zero, or a positive integer as the firstVariable is less than, equal to, or greater than the second.
@throws ExpressionEvaluationException when the comparation fails.
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