`Tesla.authorized` doesn't detect a stale-but-present invalid token

[cjw296]

Tesla.authorized is inherited unchanged from requests_oauthlib.OAuth2Session:

@property
def authorized(self):
    return bool(self.access_token)

This only tells you a token exists in the cache, not that it's still valid, so once
cache.json holds any token, even one whose refresh_token has expired, authorized still returns
True, fetch_token()/api() skip the interactive flow, and the first API call
instead falls into automatic token refresh, which fails with
oauthlib.oauth2.rfc6749.errors.LoginRequired: (login_required) The refresh_token is invalid.

My workaround is to force-clear state first:

tesla.token = {}
del tesla.access_token
tesla.fetch_token()

Feels like .authorized should do some kind of a check on this front, but doesn't feel like it would be lightweight.
Not sure what to suggest, but wanted to log it in case others encounter it.