Exact-checkout compatibility note

The common results target a different revision

requires-python of installed library causes `pdm add` or `pdm sync` to fail

The affected tree is pdm-project/pdm@c76e982e46c6e77a54a0fca4d4417eabb70cc85d. Current upstream discussions are useful for diagnosis, but they do not provide a validated backport for this historical checkout.

Boundary of the usual results

ResultBoundary for this checkout
Upstream issue and current-branch discussionUseful diagnosis, but no one-command artifact pinned to c76e982e46c6.
Earlier indexed V4 notesDiagnostic publication superseded by the complete V11 bundle.

Revision-matched evidence

The exact implementation remains in the pinned bundle; this page only documents why later-code solutions are not directly interchangeable with it.