Update: Replacing SimpleArray uses with BufferList. BufferList also avoids allocations when default-constructed. There's 2 reasons for this change: they're functionally the same(with a small change for default BufferList), but BufferList offers more. Also, and the primary reason, it allows me to refer to the type at a lower assembly level (Facepunch) so that I can continue making Pool's API more strict. Tests: checked all "targets" build in Unity, no runtime tests (well, editor runs this code outside of playmode as well, so there's that)