Optimize encoding incompressible u8#118
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Performs the same optimization integers have been doing for a while. Note: there is no change to the serialized output.
benchmarks on x86_64:
target-cpu=native (18% faster)
test derive::vec::tests2::bench_vec_zero_or_one_large_array_vec_encode 22,213 ns/iter -> 18,836 ns/iterno target-cpu (37% faster)
test derive::vec::tests2::bench_vec_zero_or_one_large_array_vec_encode 27,021 ns/iter -> 19,679 ns/iter