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b056b9e130
This is a total rewrite after having experimented with a variety of techniques including a dual-allocator strategy for small and large size classes where the large class allocator had a coalescing mechanism. This allocator design is much closer to `mimalloc` in spirit and performs almost twice as fast as the original bitmap-based design. Additionally, several bugs have been fixed. The most important one being the lock-free synchronization method used for remote frees. This design uses a single atomic pointer that is doubly-tagged to pass remote frees either to the heap or to the slab, depending on the ownership status.