Incorrect behaviour in to_dict()

[sgran]

Expectation:
Calling to_dict() on a model class will produce a dictionary composed of base types that can be correctly serialized to/from json.

Behaviour:
Deeply nested lists appear to be incorrectly handled.

The following code:

import json

from plaid.model.country_code import CountryCode
from plaid.model.depository_account_subtype import DepositoryAccountSubtype
from plaid.model.depository_account_subtypes import DepositoryAccountSubtypes
from plaid.model.depository_filter import DepositoryFilter
from plaid.model.link_token_account_filters import LinkTokenAccountFilters
from plaid.model.link_token_create_request import LinkTokenCreateRequest
from plaid.model.link_token_create_request_auth import LinkTokenCreateRequestAuth
from plaid.model.link_token_create_request_user import LinkTokenCreateRequestUser
from plaid.model.products import Products

request = LinkTokenCreateRequest(
    client_name="myClient",
    country_codes=[CountryCode("US")],
    language="en",
    products=[Products("auth"), Products("transactions")],
    user=LinkTokenCreateRequestUser(client_user_id="1234"),
    account_filters=LinkTokenAccountFilters(
        depository=DepositoryFilter(
            account_subtypes=DepositoryAccountSubtypes([DepositoryAccountSubtype(value="CHECKING")])
        )
    ),
    auth=LinkTokenCreateRequestAuth(
        instant_match_enabled=True,
    ),
)

print(json.dumps(request.to_dict()))

produces the following exception:

Traceback (most recent call last):
  File "/Users/sgran/source/wagestream/us-ws-api/scratch/t.py", line 32, in <module>
    print(json.dumps(request.to_dict()))
  File "/opt/homebrew/Cellar/python@3.9/3.9.18_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/opt/homebrew/Cellar/python@3.9/3.9.18_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/opt/homebrew/Cellar/python@3.9/3.9.18_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/opt/homebrew/Cellar/python@3.9/3.9.18_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/json/encoder.py", line 179, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type DepositoryAccountSubtype is not JSON serializable

[sgran]

It appears the problem is actually related to the use of DepositoryAccountSubtypes. If I substitute a simple [DepositoryAccountSubtype] for it in the schema, changing the constructor to:

request = LinkTokenCreateRequest(
    client_name="myClient",
    country_codes=[CountryCode("US")],
    language="en",
    products=[Products("auth"), Products("transactions")],
    user=LinkTokenCreateRequestUser(client_user_id="1234"),
    account_filters=LinkTokenAccountFilters(
        depository=DepositoryFilter(
            account_subtypes=[DepositoryAccountSubtype(value="CHECKING")]
        )
    ),
    auth=LinkTokenCreateRequestAuth(
        instant_match_enabled=True,
    ),
)

the JSON serialization succeeds.