Basket not cleared when "overflowing"/"overfull"

[alecclarke]

Describe the bug
In some cases the basket might end up with more entries than the queue_class.basket_options_hash[:size] which prevents the basket from ever performing/or being cleared.

These scenarios could happen when a certain record is added to the queue_collection but the on_success or perform raises an exception prior to the basket being cleared — and a subsequent Basket.add pushes the basket capacity passed the defined size.

To Reproduce
Steps to reproduce the behavior:

1. Explicitly raise an error in the perform action
2. Add items into the basket
3. When the basket performs, and throws an error the items aren't cleared
4. Add additional items to the basket will never trigger "perform"

Expected behavior
Ideally the basket can be cleared at some point if the contents "overflow" 😄