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Framed was designed to encapsulate both AsyncRead and AsyncWrite so that it could wrap two-way connections. It used Fuse to manage the pinned io object between the FramedWrite and FramedRead structs. I replaced the Fuse struct by isolating the state used in reading and writing, and making the code generic over that instead. This means the FramedImpl struct now has a parameter for the state, and contains the logic for both directions. The Framed* structs are now simply wrappers around this type Hopefully removing the `Pin` handling made things easier to understand, too.