Andrew Erlanger

@julianrubisch I think the problem here is that `broadcast_for!(model, operation)` (over [here](https://github.com/stimulusreflex/cable_ready/blob/aab58aac789cab06a0789bc4b028d9df47b910fb/app/models/concerns/cable_ready/updatable/collections_registry.rb#L12)) is being called on the `ActiveStorage::Attachment` class, which has two registered collections (in the dummy app). Specifically, we...

Awesome :) One thing to double-check here, although I think we should be okay, is that this doesn't have any unintended side effects for how we handle non-ActiveStorage collections (e.g....