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  "title": "Fix potential underflow in binary merge algorithm",
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  "debrief": "Devin proposed a fix for a potential underflow in binary_merge.rs, where right_scan.remaining could go negative. The change added 97 lines and removed eight across one file in four commits. It drew zero reviews before a human rider closed it unmerged. The reviewer wrote: \"The added test passes even with the logic reverted\"",
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  "body_excerpt": "# Fix potential underflow in binary merge algorithm\n\n## Issue\nThere was a potential underflow issue at line 230 in `binary_merge.rs`:\n```rust\nright_scan.remaining -= row_diff;\n```\n\nThis underflow could occur when `row_diff` (calculated as `scan_sides.len() - curr_count`) is greater than `right_scan.",
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