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If length is omitted, it defaulted to the length of the byte array, even if the start was greater than zero. It now subtracts the start from the length to get "the length of the rest of the byte array". Review URL: https://codereview.chromium.org//11098065 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@13522 260f80e4-7a28-3924-810f-c04153c831b5