I recently wrote a tool that automatically performs a migration to the finalAttrs pattern (#119942), and I believe it is now robust enough to be let loose on nixpkgs.
However this is the first large treewide change I'm performing, so I'm not 100% sure how to proceed. Some questions:

• Is this desirable at all?
• Should I perform the migration in steps or all at once?
• One big commit or one commit per package?
• Do we review all changes or only a sample?
• @infinisil you are working on the by-name migration (RFC 140 migration plan #258650). Do you think this could interfere? Should I wait until your migration is complete?

cc @drupol who was interested in this

Example run of the tool on pkgs/applications and pkgs/by-name: https://github.com/fgaz/nixpkgs/commits/finalattrs-test-8/