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if the underlying reader is buffered with a smaller buffer
it would force the chunk sizes to come out smaller than
intended.

cc @whyrusleeping @mappum

vanilla:
    21.57 real        45.14 user         8.51 sys

short:
    14.40 real        31.13 user         5.56 sys

License: MIT
Signed-off-by: Brian Tiger Chow <brian@perfmode.com>