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    Most of the benefit from this approach would come if you can often expect streams of 16 bytes to contain no white space character. This seems like a good guess in many applications.

    Sounds quite unlikely to me.

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      <a href="https://lobste.rs/s/fajid3/pruning_spaces_from_strings_quickly_on">Pruning spaces from strings</a> has 80 consecutive bytes of non-whitespace, which is 4 or 5 chunks depending on how it ends up aligned.