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Compare each block with two blocks divided at its midpoint token boundary, including their Huffman headers and stored-block alignment. Emit the smaller plan and preserve final-block flags.
Map tiles are 1.54% smaller at level 6 and 1.91% smaller at level 9. Across all fixtures the weighted reduction is only 0.006–0.007%, with no size regression in 70 corpus/level cases. Planning adds work: the final development JVM run measured the small model at 0.116 ms versus 0.067 ms before. Text timing is unstable across unchanged-baseline forks, so its single-fork comparison is provisional.
Linux JVM tests, 100% instruction/branch coverage verification and all 70 JDK/KFlate round trips passed. Tests cover exact block ends and unavailable-source behavior; the redundant invalid-midpoint guard is removed. Raw timings, sizes and saved Kompress comparisons are in
performance/2026-09-09-split/RESULTS.md.Independent PR against
dev-1.1.0. The stored-block alignment helper overlaps #33 and must be deduplicated if both are merged.