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ae90eccb - Fix clippy::cast_lossless (pedantic)

Fix clippy::cast_lossless (pedantic) “casting `bool` to `u8` is more cleanly stated with `u8::from(_)`” https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless Signed-off-by: Anders Kaseorg <andersk@mit.edu>