- lazily decode cache files for checking invalidation [#7516](https://github.com/haskell/cabal/pull/7516)[#7466](https://github.com/haskell/cabal/issues/7466)
- This yields a significant 15% speedup on rebuilding build plans for projects with lots of individual cabal packages.
- It exports the [Tag data type](https://github.com/haskell/cabal/blob/899dd34bc48bbaa43da9a4b2fc354c24fd814d05/Cabal/src/Distribution/Utils/Structured.hs#L67), needed by cabal-install >= 3.6.0.0
- defer build-tools-depends choices as well as setup choices [#7561](https://github.com/haskell/cabal/pull/7561)[#7472](https://github.com/haskell/cabal/issues/7472)
- extends the existing solver pass that defers solving setup depends until top-level goals are solved to also defer build-tool-depends goals until top level goals are solved.
