xLaDe
A Lean 4 Ecosystem Framework!
Lean 4 proofs break silently across versions. Projects built on Lean drift from upstream until one day they simply stop working. Nobody knows why. These are not edge cases. They are the normal experience of working with a proof assistant under rapid development.
xLaDe is a research platform that studies these problems and builds tooling to address them. It is not a theorem library, a fork of Lean, or a replacement for any existing tool.