mir-backend-ruby

Make It Right (Ruby runtime tier). YARV/MRI Ruby 4.0 runtime reliability footguns shared across EVERY Ruby backend framework (Rails, Sinatra, Hanami, Sidekiq/Solid Queue workers) — distinct from the generic backend gates and from any one framework's mechanics. Covers: the GVL (threads give no CPU parallelism, like Python's GIL), the reworked Ractor API in Ruby 4.0, YJIT/ZJIT enablement, Puma's forked-worker + thread…