Speeds up truncation on 4K bytesize ~40x faster, 2k bytesize ~12x faster,#1

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Commits on Jun 7, 2011

Speeds up truncation on 4K bytesize ~40x faster, 2k bytesize ~12x faster, 1k+1 ~13x slower but speeds become comparable rapidly (around 1.1K). Speed remains pretty much constant for all data sizes.
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