validateNumberRules(length) {
        if (length > 100) {
            return errorInstances.InvalidRequest
            .customizeDescription(customizedErrs.numberRules);
        }
        return true;
    }
_validator.validateNumberRules - return if number of rules exceeds 100
@param {number} length - array containing number string
@return {(Error|true)} - Arsenal error on failure, true on success