ServiceNow - Flow Designer Actionのバグ

#概要
ServiceNow FlowDesignerのActionで名前が「value」のJSONを送ると、JSONの値と置き換わる。

##例
###スクリプトステップ
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/37ab2be1-b070-0524-5ed4-98c8822339db.png)
###実行
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/941a1ba1-03be-1668-77cb-17640356260b.png)
###結果：「{"value": "100"}」ではなく「100」に置き換わっている。
![image.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/dd7d4294-0f31-280d-6543-0a434b9f88b4.png)

#詳細（再現手順）
1. フローディザイナーを開く
2. アクションを作成<br/>![flow_designer_json_bug_1.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/18edd83d-8f35-4124-bbcb-4522229a2a52.png)
3. <br/>![flow_designer_json_bug_2.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/acd594b1-e5d8-d53b-72ee-7786dc947d82.png)
4. <br/>![flow_designer_json_bug_3.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/73560ee8-f0f7-2dd6-2300-3380dc3d67c5.png)
5. <br/>![flow_designer_json_bug_4.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/c4331f79-59a1-3398-5a1d-aa319bed3600.png)
6. <br/>![flow_designer_json_bug_5.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/d626a043-4c75-aa34-53e5-c7b275687ad2.png)
7. <br/>![flow_designer_json_bug_6.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/7514dad4-b6c1-c562-e476-99d207297e8e.png)
8. <br/>![flow_designer_json_bug_7.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/c1824e1a-7df8-4fc7-e754-d0abd4c15912.png)
9. <br/>![flow_designer_json_bug_8.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/09da68af-4c20-9985-4636-59e2938ad0da.png)
10. <br/>![flow_designer_json_bug_9.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/71bb43af-fe8f-b22f-86b1-63e7f13874e1.png)
11. <br/>![flow_designer_json_bug_10.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/419bafd8-31d0-1503-82ec-91422d4ea685.png)
12. <br/>![flow_designer_json_bug_11.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/8ffa13b4-4f4c-6778-f687-198130db90dc.png)
13. 入力の値をそのまま出力に設定する。<br/>![flow_designer_json_bug_12.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/15b0dcc7-6009-3829-e2a8-8ec88a49d24a.png)
14. 試してみる。<br/>![flow_designer_json_bug_13.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/782d0f1b-3b2f-43ef-629e-a3eeba732348.png)
15. 先ずは通常のJSONで試してみる。<br/>![flow_designer_json_bug_14.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/9eac0f08-144e-4751-42da-aa8d91cfb5d9.png)
16. <br/>![flow_designer_json_bug_15.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/916e536d-22af-5b29-1470-41bddda1f828.png)
17. 結果は入力したJSON<br/>![flow_designer_json_bug_16.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/eb184c32-15fb-1d1a-f9da-46592fb0703f.png)
18. キーが「value」のJSONを指定してテストを実行<br/>![flow_designer_json_bug_17.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/7b0f7842-3351-d9f3-761c-6305a3ad6597.png)
19. 結果を見る。<br/>![flow_designer_json_bug_18.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/57693d94-722b-5919-d1e4-d994020dc45a.png)
20. JSONが値「100」に置き換えられている。<br/>![flow_designer_json_bug_19.png](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/698027/c3ac2907-c42c-77ac-0c9a-bb703931b507.png)

以上