It's the only way to properly clean all background tasks,
which the library makes heavy use for in MTProto/Connection
send and receive loops.
Some parts of the code even relied on the fact that it was
asynchronous (it used to return a future so you could await
it and not be breaking).
It's automatically syncified to reduce the damage of being
a breaking change.
This one in particular may happen when iterating over messages,
perhaps more likely to happen if the group was created in a
different data center.
A small sleep of a few seconds also greatly increases the
chances of the error going away.
Things like SQLAlchemy work correctly only for timezone-aware datetimes.
The returned TLObjects all have them, but those that are manually created
were missing them, so serializing the state into SQLAlchemy sessions failed.
The salt1 that is sent to the server requires an additional 32 bytes
of random data. It's easy to miss this requirement from reading the
tdesktop source, because this extension is done in a function called
`ValidateNewCloudPasswordAlgo`.
https://github.com/telegramdesktop/tdesktop/blob/2e5a0e056cdb40d61d487c6062bffe1a835f
6ddd/Telegram/SourceFiles/core/core_cloud_password.cpp#L210-L211
