ashb commented on issue #13934:
URL: https://github.com/apache/airflow/issues/13934#issuecomment-808389284
I think generally the extra should be encoded as query-string-escaped json,
so:
```
%7B%22a%22%3A%7B%22b%22%3A%221%22%2C%22c%22%3A%7B%22d%22%3A%222%22%7D%7D%2C%22e%22%3A%223%22%7D
```
It's _unwieldly as anything_
```python console
In [18]: conn =
airflow.models.connection.Connection(uri='emr:///?foo=%7B%22a%22%3A%7B%22b%22%3A%221%22%2C%22c%22%3A%7B%22d%22%3A%222%22%7D%7D%2C%22e%22%3A%223%22%7D');
In [19]: conn.extra_dejson
Out[19]: {'foo': '{"a":{"b":"1","c":{"d":"2"}},"e":"3"}'}
```
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