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When built with `rustc -O`: before: test bench_read_slice ... bench: 68 ns/iter (+/- 56) test bench_read_vec ... bench: 78 ns/iter (+/- 21) test bench_write_slice ... bench: 133 ns/iter (+/- 46) test bench_write_vec ... bench: 308 ns/iter (+/- 69) after: test bench_read_slice ... bench: 32 ns/iter (+/- 10) test bench_read_vec ... bench: 32 ns/iter (+/- 8) test bench_write_slice ... bench: 53 ns/iter (+/- 12) test bench_write_vec ... bench: 247 ns/iter (+/- 172)