Clippy suggestions #14
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Note that `write` only seems to be correct with `len` <= u16::MAX so I've changed the `assert` for that. If the `assert` passes the new `unwrap` should also be safe. [Whether the `u16::MAX` limit maximum is a good idea or not is beyond my ken!]
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This PR has two commits taking onboard suggestions from Clippy. The first commit is the (hopefully) "obviously correctly (TM)" stuff (82003c9). The second commit has some trickier aspects which I think bear more careful scrutiny (d7ea93b). I have lightly tested this and it doesn't seem to break anything, but I am acutely conscious that I can't test all the code paths.