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`TailQueue` was implemented as a doubly-linked list, but named after an abstract data type. This was inconsistent with `SinglyLinkedList`, which can be used to implement an abstract data type, but is still named after the implementation. Renaming `TailQueue` to `DoublyLinkedList` improves consistency between the two type names, and should help discoverability. `TailQueue` is now a deprecated alias of `DoublyLinkedList`. Related to issues #1629 and #8233.