Starlette OAuth causes invalid auth argument on HTTPX 0.18.2

[alessandroralc]

After upgrading to HTTPX 0.18.2, the starlette oauth module started to crash.

When i call the oauth authorize_redirect method, i get the following error: Invalid "auth" argument: <httpx._config.UnsetType object at 0x7fb5ac920310>"}

In HTTPX 0.18.1, everything works like a charm.

Could you verify? Thanks in advance.