chore(blooms): allocator is best effort; uses pool if available otherwise allocs #13286
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Ideally, we'd always return buffers to the pool, but ensuring this in the code is tricky & error prone. Instead, we'll treat allocators as best effort & measure them. This should probabilistically create the reuse we want in lieu of a more perfect solution and allow us to continue using & repopulating pools when we drop pointers.