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@headius.bsky.social @eregon.me intertwingly.net/blog/2026/09... - let me know what conclusions I may have gotten wrong or what areas I should explore next.

> And TruffleRuby, unlike JRuby, keeps a global interpreter lock for Ruby code That's incorrect, TruffleRuby doesn't have a GVL for Ruby code for 10+ years. What you likely see is a C extension not marked as Ractor-safe or Thread-safe, and that then uses a C extension lock for compatibility.