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The October 30 Rails changes suggest four regression checks: scoped preload results, retained text types, CurrentAttributes defaults and keyword-valued HTML. Synthetic fixtures compare Rails 8.1.4 with pinned main.
The October 23 Rails changes sharpen three upgrade checks: accepted message formats, local-secret permissions and SQLite schema preservation. Reproductions compare released Rails 8.1.4 with pinned main.
Work through the Rails upgrade ladder with retained defaults, a tested 7.0 to 7.1 hop, a gem verdict sheet and explicit reader compatibility checks.
Check the Ruby requirement, replace dynamic route segments carefully, and test validation error consumers against the exact Rails source you plan to use.
Find old deserializers in Rails cookies, messages, caches and database columns. Tested examples distinguish a new writer from removal of the old reader.
A measured local rehearsal checks restored data, queued work and signing secrets, with a cutover checklist and a reasoned case for staying on Heroku.
A runnable Rails CI fixture exposes dependency mismatches, misleading job assertions, schema drift and shared test state, with failures and repairs recorded.