Internal server error on exchanges query after IPEX grant message

[lenkan]

I tried using the branch here WebOfTrust/signify-ts#118 to create a credential and sending an IPEX grant message to a holder AID. The holder receives a notification as I would expect.

However, when I was trying to figure out how to send back an "admit" message from the holder I inspected the /identifiers/{name}/exchanges/query endpoint in KERIA and noticed an internal server error originating from here:

keria/src/keria/peer/exchanging.py

Line 143 in e2a6b96

rep.data = json.dumps(exns).encode("utf-8")

The error is that bytearray is not serializable to JSON. The values in the "pathed" dictionary that are of type bytearray. I probably shouldn't be using the /exchanges/query endpoint directly (?). But I thought it might be important to catch the error anyway. Unfortunately I cannot navigate the KERIA codebase well enough to create a minimal reproduction at the moment.

This is the received error message:

keri: Parsed Request:
POST /identifiers/recipient/exchanges/query {(1, 1)
Hict([('host', '127.0.0.1:3901'), ('connection', 'keep-alive'), ('content-type', 'application/json'), ('signature', 'indexed="?0";signify="..."'), ('signature-input', 'signify=("@method" "@path" "signify-resource" "signify-timestamp");created=1697557238;keyid="...";alg="ed25519"'), ('signify-resource', '...'), ('signify-timestamp', '2023-10-17T15:40:38.274000+00:00'), ('accept', '*/*'), ('accept-language', '*'), ('sec-fetch-mode', 'cors'), ('user-agent', 'undici'), ('accept-encoding', 'gzip, deflate'), ('content-length', '2')])

2023-10-17 15:40:38 [FALCON] [ERROR] POST /identifiers/recipient/exchanges/query => Traceback (most recent call last):
  File "falcon/app.py", line 365, in falcon.app.App.__call__
  File "/usr/local/lib/python3.10/site-packages/keria/peer/exchanging.py", line 143, in on_post
    rep.data = json.dumps(exns).encode("utf-8")
  File "/usr/local/lib/python3.10/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/usr/local/lib/python3.10/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/local/lib/python3.10/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/local/lib/python3.10/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type bytearray is not JSON serializable