v2026.4.0

What's Changed

• feat: disable virtual array caching on themselves if a nanoevents buffer cache is used by @ikrommyd in #1507
• chore: more restrictive linting in ruff by @lgray in #1505
• ci: bump actions/attest-build-provenance from 3.0.0 to 3.1.0 by @dependabot[bot] in #1509
• ci(pre-commit): pre-commit autoupdate by @pre-commit-ci[bot] in #1510
• chore: fix treemaker schema uproot writing test to write TTree by @ariostas in #1514
• feat: Schema updates to run on PHYSLITE processed through ServiceX + link improvements by @ponyisi in #1511
• ci: bump actions/attest-build-provenance from 3.1.0 to 3.2.0 by @dependabot[bot] in #1515
• feat: let zero-event files go through pre-processing by @ikrommyd in #1501
• ci(pre-commit): pre-commit autoupdate by @pre-commit-ci[bot] in #1516
• fix: UpDownSystematic test being skipped due to typo + use public ak.mixin_class for systemetics by @ikrommyd in #1517
• chore: remove deprecations by @ikrommyd in #1519
• ci: bump actions/attest-build-provenance from 3.2.0 to 4.1.0 by @dependabot[bot] in #1523
• ci(pre-commit): pre-commit autoupdate by @pre-commit-ci[bot] in #1524
• chore: update uproot pin and use https for logo in README by @ikrommyd in #1526
• docs: Adding recipe for what to do with fake None-able arrays in dask-wrapper tools by @yimuchen in #1525
• feat: add buffer caches by @pfackeldey in #1508
• feat: correctionlib (JSON-POG) adapter classes for CorrectedJetsFactory by @alefisico in #1521
• ci: use conda for CI testing setup by @ikrommyd in #1540
• ci: bump mamba-org/setup-micromamba from 2 to 3 by @dependabot[bot] in #1542
• ci: bump codecov/codecov-action from 5 to 6 by @dependabot[bot] in #1543
• ci(pre-commit): pre-commit autoupdate by @pre-commit-ci[bot] in #1546
• feat: add uproot_options in preprocessing by @ikrommyd in #1545
• feat: improve nanoevents reading error messages and allow reading from string root file path as long as treepath is specified by @ikrommyd in #1531
• ci: start testing 3.14t by @ikrommyd in #1541
• feat: add preload feature to Runner API by @pfackeldey in #1423

New Contributors

• @ponyisi made their first contribution in #1511

Full Changelog: v2025.12.0...v2026.4.0