[Diff since v1.20.0](v1.20.0...v1.21.0)

**Merged pull requests:**
- Update SciMLBase requirement from 2.116 to 2.116, 3.0 in the all-julia-packages group across 1 directory (#126) (@dependabot[bot])

[Diff since v1.19.0](v1.19.0...v1.20.0)

**Merged pull requests:**
- Update RecursiveArrayTools compat to support v4 (#125) (@ChrisRackauckas-Claude)

[Diff since v1.18.0](v1.18.0...v1.19.0)

**Merged pull requests:**
- Update OrdinaryDiffEqDifferentiation requirement from 1.16 to 1.16, 2.0 in the all-julia-packages group across 1 directory (#121) (@dependabot[bot])
- Fix deprecation warnings (#122) (@ChrisRackauckas-Claude)
- Bump version to v1.19.0 (#123) (@ChrisRackauckas-Claude)

[Diff since v1.17.0](v1.17.0...v1.18.0)

**Merged pull requests:**
- Improve static analysis: fix JET errors and add JET tests (#117) (@ChrisRackauckas-Claude)
- Switch from JuliaFormatter to Runic.jl for code formatting (#118) (@ChrisRackauckas-Claude)
- Bump actions/checkout from 4 to 6 (#119) (@dependabot[bot])
- Update OrdinaryDiffEqCore requirement from 1.30.0, 2.0 to 1.30.0, 2.0, 3.1 in the all-julia-packages group across 1 directory (#120) (@dependabot[bot])

**Closed issues:**
- Segfault on 1.10 due to invalid getrs! inputs (#72)

[Diff since v1.16.0](v1.16.0...v1.17.0)

**Merged pull requests:**
- Bump actions/checkout from 4 to 6 (#111) (@dependabot[bot])
- Add Julia ecosystem to Dependabot configuration (#112) (@ChrisRackauckas-Claude)
- Update ForwardDiff requirement from 0.10 to 0.10, 1.3 in the all-julia-packages group across 1 directory (#113) (@dependabot[bot])
- Update OrdinaryDiffEqCore requirement from 1.30.0 to 1.30.0, 2.0 in the all-julia-packages group across 1 directory (#114) (@dependabot[bot])

[Diff since v1.15.0](v1.15.0...v1.16.0)

**Merged pull requests:**
- Fix #106: Add generic cache iteration for DifferentiationInterface compatibility (#110) (@ChrisRackauckas-Claude)

**Closed issues:**
- DiffEq pieces are still using the old caches, e.g. `FiniteDiff.JacobianCache` (#106)

[Diff since v1.14.0](v1.14.0...v1.15.0)

**Merged pull requests:**
- Add spell checking configuration (#100) (@ChrisRackauckas)
- [ci skip] Fix spelling errors (#101) (@ChrisRackauckas)
- Add downgrade CI workflow (#102) (@ChrisRackauckas)
- Apply JuliaFormatter to fix code formatting (#103) (@ChrisRackauckas)
- Update dependencies: add OrdinaryDiffEqCore and OrdinaryDiffEqRosenbrock (#109) (@ChrisRackauckas-Claude)

[Diff since v1.13.0](v1.13.0...v1.14.0)

**Merged pull requests:**
- fix Vararg docs (#97) (@oscardssmith)
- Move sparsedifftools dep to an extension (#98) (@ChrisRackauckas)

[Diff since v1.12.0](v1.12.0...v1.13.0)

**Merged pull requests:**
- Bump actions/cache from 3 to 4 (#86) (@dependabot[bot])
- Bump codecov/codecov-action from 3 to 4 (#87) (@dependabot[bot])
- Bump julia-actions/setup-julia from 1 to 2 (#89) (@dependabot[bot])
- ci: standardise workflows using SciML's reusable workflows (#90) (@thazhemadam)
- Added two newlines to display correctly the code blocks (#91) (@pitsianis)
- ci: test with `1`, `lts` and `pre` versions of julia (#94) (@thazhemadam)
- remove deprecated `Vararg` versions (#96) (@oscardssmith)

[Diff since v1.11.0](v1.11.0...v1.12.0)

**Merged pull requests:**
- chore: bump RecursiveArrayTools compat (#82) (@AayushSabharwal)