A new way to manage memory: no garbage collection, extremely fast & safe access

The U programming language manages memory using a Directed Acyclic Graph of ownership, eliminating garbage collection by deallocating subtrees when reference counts hit zero. It utilizes slab chain allocators for O(1) bump-pointer allocations and NaN-boxed tagged values for efficient data representation. Lists and Maps maintain stable memory addresses, ensuring O(1) random access and appending.