public function setRules($fieldNameOrArray, $rules = [])
    {
        // Determine Parameter Mode:
        
        if (is_array($fieldNameOrArray)) {
            
            // Define All Rules:
            
            foreach ($fieldNameOrArray as $fieldName => $rules) {
                $this->setRules($fieldName, $rules);
            }
            
        } else {
            
            // Define Rules for Specified Field:
            
            foreach ($rules as $rule) {
                $this->setRule($fieldNameOrArray, $rule);
            }
            
        }
        
        // Answer Self:
        
        return $this;
    }