awsebcliのexit codeが正しくない件

問題

awsebcli v3.7.7だと実行が失敗してもエラーコードが0になってしまう。

$ eb --version
EB CLI 3.7.7 (Python 2.7.1)

$ eb deploy app-staging
WARNING: You have uncommitted changes.
Creating application version archive "app-5b75-260729_205520".
Uploading app-api/app-5b75-260729_205520.zip to S3. This may take a while.
Upload Complete.
ERROR: The configuration file .ebextensions/001.base.config in application version app-5b75-260729_205520 contains invalid YAML or JSON. YAML exception: mapping values are not allowed here
 in "<reader>", line 4, column 19:
        RootVolumeSize: '10'
                      ^
, JSON exception: Unexpected character (#) at position 0.. Update the configuration file.

$ echo $?
0

なんてこった。

回避

いろいろ試したところ、v3.7.4からの起こってるようなのでv3.7.3 を使う。

$ eb --version
EB CLI 3.7.3 (Python 2.7.1)

$ eb deploy app-staging
WARNING: You have uncommitted changes.
Creating application version archive "app-5b75-160727_215320".
Uploading app-api/app-5b75-160727_215320.zip to S3. This may take a while.
Upload Complete.
ERROR: The configuration file .ebextensions/001.base.config in application version app-5b75-160727_215320 contains invalid YAML or JSON. YAML exception: mapping values are not allowed here
 in "<reader>", line 4, column 19:
        RootVolumeSize: '10'
                      ^
, JSON exception: Unexpected character (#) at position 0.. Update the configuration file.

$ echo $?
4

ふう。

これはどこにフィードバックすれば良いんだろう。
aws forumに追記した。

コードはgithubに公開して欲しいなぁ