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"Nine days ago the compiled Campfire passed 167 of its own tests. Today it passes 299 of 300 — against a newer Campfire than before, one that brought fifteen security commits and their tests, all of which pass as written. The one test left is the one Ruby construct no compiler can take, and it turns out the test never needed it. That is the first and only change I have ever proposed to Campfire's source, and this post is mostly about why it was the exception the rule was written to allow."

"In June I argued that Roundhouse's emitted Ruby is the Ruby JRuby was built to run: strip Rails' interpretive layers and the JVM's JIT pays a further 5–6× on top, where stock Rails gets 2×. Benoit Daloze asked the obvious next question — what does TruffleRuby do with it? — and the answer inverts the June result. Graal rewards stock Rails more than it rewards the emit. Two JITs, the same Rails application, the same emitted code, and the dividend has the opposite sign. Along the way the experiment found a data race in my runtime, an error page masquerading as a benchmark, and a governor that had been unpinned since June."

"Five months in and it is time to cut the first release. Take your pick of analysis tools, transpilation, or compilation."

"Spinel decides two things about every Ruby program it compiles: what it refuses, and which values fall off the typed fast path into boxed untyped. Until this week you learned both from stderr and a JSON file. Now there is a browser page that shows them as you type, a language server that shows them in your editor, and an MCP server that answers them for an agent. All three are early, all three are rebuilt from Spinel's current source and tested before they are published, and what I want from you is to try them and tell me what you hovered over and what you expected to see."

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