[6.40] [treeplayer] Fix precision loss in TTree::Scan for 64-bit integers#22665
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guitargeek merged 1 commit intoJun 21, 2026
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The `"lld"` column format passed without an embedded size (e.g. via `"colsize=N col=lld"`) was not recognized as a `"long long"` modifier in **TTreeFormula::PrintValue**, so 64-bit integer branches (e.g. `ULong64_t`) were evaluated as double and rounded above 2^53. This commit fixes a off-by-one problem in the length-modifier detection to address the issue, adding also a regression test. Closes root-project#7844. 🤖 Done with the help of [Claude Code](https://claude.com/claude-code) (Claude Opus 4.8) (cherry picked from commit 7cea10c)
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guitargeek
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Jun 19, 2026
Test Results 22 files 22 suites 3d 12h 16m 46s ⏱️ For more details on these failures, see this check. Results for commit 149ddd6. |
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Backport of #22600, requested by @dpiparo. For your information @guitargeek