Butler

Memory management for Luau, with O(1) removal and LIFO cleanup for instances, connections and threads.

• Doubly linked list internally: removal is O(1) rather than a scan, and cleanup runs LIFO.
• Instances, connections, threads and functions all go through one Add, with Connect, Once and ConnectParallel wrappers.
• Extend nests butlers, so cleaning a parent cleans everything below it.
• AttachToInstance ties a butler’s lifetime to an instance being destroyed.
• Used in production by Zero Pressure, The Next Vessel and Last Wave.