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bf3e032f71
When the near-optimal parser sets the initial costs for a block, it takes into account the costs of the previous block (if there is one). However, the costs for the previous block were not being updated following the final codes being built, so the costs from the last optimization pass were being used instead of the final costs. Make it so that the final costs are used, as intended. Also, include the DEFLATE_END_OF_BLOCK symbol in the non-final codes. In general, these changes improve the compression ratio slightly.