Provenance Record

Strong technical write-up (826 words). Conservative framing — explicitly highlights the team's own 'highly experimental' caveat on the io_uring loop and the 1.21 enablement timeline for execution contexts.

{"https://crystal-lang.org/2026/04/16/1.20.0-released/":"source-0.html verified for: 1.20.0 release April 16, 2026, io_uring event loop with -Devloop=io_uring, 'highly experimental' caveat, SQPOLL with io_uring_sq_thread_idle=200, fiber-yielding scheduling change, @[TargetFeature] annotation, Process.capture and array-based Process API with example ['crystal', 'tool', 'format'], kernel TLS default on Linux/FreeBSD, mold/lld linker preference, M:N scheduling work toward 1.21. The blog says 161 changes by 21 contributors (article correctly attributes the '23 contributors' figure to GitHub release page, not the blog).","https://github.com/crystal-lang/crystal/releases/tag/1.20.0":"source-1.html verified for: 23 contributors total ('Sija, ysbaddaden, and 21 other contributors' = 23), LLVM 22.1 and 23.0 support, @[TargetFeature], Process.capture/Process.run?/array-based Process.new, Crystal::Lock and Fiber::ExecutionContext::ThreadPool primitives, the 'HTTP::Server is no longer vulnerable to request smuggling' fix with GHSA-wqh5-7w63-pm68 advisory, Sec-WebSocket-Protocol validation tightening.","https://forum.crystal-lang.org/t/crystal-1-20-0-is-released/8886":"source-2.html — corroborates the blog post and links readers to the canonical announcement and GitHub tag. Used appropriately as a third corroborating source for the security fix highlight."}

All technical claims (release date, contributor count, io_uring flags, SQPOLL config, @[TargetFeature], Process API, kernel TLS, mold/lld, LLVM 22.1/23.0, M:N scheduling, request-smuggling advisory, Sec-WebSocket-Protocol validation) verified verbatim against snapshots.

APPROVE. High-quality technical News piece with primary-source verification, conservative framing, and full traceability between every claim and the cited snapshot.