Read clarification#23847

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alexcrichton merged 4 commits intomasterfrom

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Apr 2, 2015

Commits on Mar 29, 2015

Clarified and simplified algorithm for increasing size of buffer in
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80 character line limit
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Clearer wording
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Commits on Mar 30, 2015

Only zero at most 64k at a time. We still use the doubling
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