[{"data":1,"prerenderedAt":450},["ShallowReactive",2],{"navigation_docs":3,"-decisions-0003-pin-kyo-rc7-and-jdk-25":223,"-decisions-0003-pin-kyo-rc7-and-jdk-25-surround":445},[4,26,96,105,202],{"title":5,"icon":6,"path":7,"stem":8,"children":9,"page":25},"Getting started","i-lucide-rocket","\u002Fgetting-started","1.getting-started",[10,15,20],{"title":11,"path":12,"stem":13,"icon":14},"Installation","\u002Fgetting-started\u002Finstallation","1.getting-started\u002F1.installation","i-lucide-download",{"title":16,"path":17,"stem":18,"icon":19},"The first app","\u002Fgetting-started\u002Ffirst-app","1.getting-started\u002F2.first-app","i-lucide-play",{"title":21,"path":22,"stem":23,"icon":24},"The first test","\u002Fgetting-started\u002Ffirst-test","1.getting-started\u002F3.first-test","i-lucide-flask-conical",false,{"title":27,"icon":28,"path":29,"stem":30,"children":31,"page":25},"Guide","i-lucide-book-open","\u002Fguide","2.guide",[32,37,42,47,52,57,62,67,72,77,81,86,91],{"title":33,"path":34,"stem":35,"icon":36},"Components","\u002Fguide\u002Fcomponents","2.guide\u002F01.components","i-lucide-component",{"title":38,"path":39,"stem":40,"icon":41},"Inputs and forms","\u002Fguide\u002Finputs-and-forms","2.guide\u002F02.inputs-and-forms","i-lucide-text-cursor-input",{"title":43,"path":44,"stem":45,"icon":46},"Scrolling and viewports","\u002Fguide\u002Fscrolling","2.guide\u002F03.scrolling","i-lucide-scroll-text",{"title":48,"path":49,"stem":50,"icon":51},"Overlays and layers","\u002Fguide\u002Foverlays","2.guide\u002F04.overlays","i-lucide-layers",{"title":53,"path":54,"stem":55,"icon":56},"Styles and theme","\u002Fguide\u002Fstyles","2.guide\u002F05.styles","i-lucide-palette",{"title":58,"path":59,"stem":60,"icon":61},"Composables","\u002Fguide\u002Fcomposables","2.guide\u002F06.composables","i-lucide-puzzle",{"title":63,"path":64,"stem":65,"icon":66},"Widgets","\u002Fguide\u002Fwidgets","2.guide\u002F07.widgets","i-lucide-blocks",{"title":68,"path":69,"stem":70,"icon":71},"The assistant","\u002Fguide\u002Fassistant","2.guide\u002F08.assistant","i-lucide-message-square",{"title":73,"path":74,"stem":75,"icon":76},"The same app on the web","\u002Fguide\u002Fweb","2.guide\u002F09.web","i-lucide-globe",{"title":78,"path":79,"stem":80,"icon":24},"Testing","\u002Fguide\u002Ftesting","2.guide\u002F10.testing",{"title":82,"path":83,"stem":84,"icon":85},"Running and packaging","\u002Fguide\u002Fpackaging","2.guide\u002F11.packaging","i-lucide-package",{"title":87,"path":88,"stem":89,"icon":90},"The terminal contract","\u002Fguide\u002Fterminal","2.guide\u002F12.terminal","i-lucide-square-terminal",{"title":92,"path":93,"stem":94,"icon":95},"Benchmarks","\u002Fguide\u002Fbenchmarks","2.guide\u002F13.benchmarks","i-lucide-gauge",{"title":97,"icon":98,"path":99,"stem":100,"children":101,"page":25},"AI and agents","i-lucide-bot","\u002Fai","3.ai",[102],{"title":97,"path":103,"stem":104,"icon":98},"\u002Fai\u002Fagents","3.ai\u002F1.agents",{"title":106,"icon":107,"path":108,"stem":109,"children":110},"Decisions","i-lucide-scale","\u002Fdecisions","4.decisions",[111,114,118,122,126,130,134,138,142,146,150,154,158,162,166,170,174,178,182,186,190,194,198],{"title":112,"path":108,"stem":113,"icon":46},"All decisions","4.decisions\u002Findex",{"title":115,"path":116,"stem":117},"0001. kyo-ui is the DSL","\u002Fdecisions\u002F0001-kyo-ui-is-the-dsl","4.decisions\u002F0001-kyo-ui-is-the-dsl",{"title":119,"path":120,"stem":121},"0002. jatatui renders the cells","\u002Fdecisions\u002F0002-jatatui-renders-the-cells","4.decisions\u002F0002-jatatui-renders-the-cells",{"title":123,"path":124,"stem":125},"0003. Pin Kyo 1.0.0-RC7 and JDK 25","\u002Fdecisions\u002F0003-pin-kyo-rc7-and-jdk-25","4.decisions\u002F0003-pin-kyo-rc7-and-jdk-25",{"title":127,"path":128,"stem":129},"0004. Public Kyo APIs only","\u002Fdecisions\u002F0004-public-kyo-apis-only","4.decisions\u002F0004-public-kyo-apis-only",{"title":131,"path":132,"stem":133},"0005. A SOFT frame contract and an own watcher loop","\u002Fdecisions\u002F0005-soft-frame-contract-and-own-watcher-loop","4.decisions\u002F0005-soft-frame-contract-and-own-watcher-loop",{"title":135,"path":136,"stem":137},"0006. Purity: edge files, lint and a pure painter","\u002Fdecisions\u002F0006-purity-edge-files-and-lint","4.decisions\u002F0006-purity-edge-files-and-lint",{"title":139,"path":140,"stem":141},"0007. Compiler flags from sbt-tpolecat","\u002Fdecisions\u002F0007-compiler-flags-from-sbt-tpolecat","4.decisions\u002F0007-compiler-flags-from-sbt-tpolecat",{"title":143,"path":144,"stem":145},"0008. The artifact split: runner, app, testkit and core","\u002Fdecisions\u002F0008-artifact-split-runner-app-testkit-core","4.decisions\u002F0008-artifact-split-runner-app-testkit-core",{"title":147,"path":148,"stem":149},"0009. tui4s-use and tui4s-widgets, cross-built","\u002Fdecisions\u002F0009-use-and-widgets-cross-built","4.decisions\u002F0009-use-and-widgets-cross-built",{"title":151,"path":152,"stem":153},"0010. The flagship assistant is the blueprint of a real app","\u002Fdecisions\u002F0010-the-flagship-assistant-as-blueprint","4.decisions\u002F0010-the-flagship-assistant-as-blueprint",{"title":155,"path":156,"stem":157},"0011. The web target: a standalone Scala.js app and one theme","\u002Fdecisions\u002F0011-web-target-standalone-scalajs-and-one-theme","4.decisions\u002F0011-web-target-standalone-scalajs-and-one-theme",{"title":159,"path":160,"stem":161},"0012. The documentation is example-first","\u002Fdecisions\u002F0012-documentation-is-example-first","4.decisions\u002F0012-documentation-is-example-first",{"title":163,"path":164,"stem":165},"0013. Benchmarks in the repository, with their own build","\u002Fdecisions\u002F0013-benchmarks-in-repo-with-own-build","4.decisions\u002F0013-benchmarks-in-repo-with-own-build",{"title":167,"path":168,"stem":169},"0014. Release per module, by tag, as 0.1.0-RC1","\u002Fdecisions\u002F0014-release-per-module-tags-and-rc1","4.decisions\u002F0014-release-per-module-tags-and-rc1",{"title":171,"path":172,"stem":173},"0015. Packaging: the AOT cache in the start scripts, native-image as an option","\u002Fdecisions\u002F0015-packaging-aot-cache-and-native-image","4.decisions\u002F0015-packaging-aot-cache-and-native-image",{"title":175,"path":176,"stem":177},"0016. Process: lean mode and agent roles","\u002Fdecisions\u002F0016-process-lean-mode-and-agent-roles","4.decisions\u002F0016-process-lean-mode-and-agent-roles",{"title":179,"path":180,"stem":181},"0017. Deferred: templates, mouse, the kitty keyboard protocol and Windows","\u002Fdecisions\u002F0017-deferred-templates-mouse-and-kitty","4.decisions\u002F0017-deferred-templates-mouse-and-kitty",{"title":183,"path":184,"stem":185},"0018. pini4s is a vendored Git submodule","\u002Fdecisions\u002F0018-pini4s-as-a-vendored-submodule","4.decisions\u002F0018-pini4s-as-a-vendored-submodule",{"title":187,"path":188,"stem":189},"0019. Upstream issues are drafts that the user posts","\u002Fdecisions\u002F0019-upstream-kyo-issues-as-drafts","4.decisions\u002F0019-upstream-kyo-issues-as-drafts",{"title":191,"path":192,"stem":193},"0020. Release from the Actions form","\u002Fdecisions\u002F0020-release-from-the-actions-form","4.decisions\u002F0020-release-from-the-actions-form",{"title":195,"path":196,"stem":197},"0021. The rulebook is CONTRIBUTING.md","\u002Fdecisions\u002F0021-the-rulebook-is-contributing-md","4.decisions\u002F0021-the-rulebook-is-contributing-md",{"title":199,"path":200,"stem":201},"0022. The logo is text","\u002Fdecisions\u002F0022-the-logo-is-text","4.decisions\u002F0022-the-logo-is-text",{"title":203,"icon":204,"path":205,"stem":206,"children":207,"page":25},"Project","i-lucide-compass","\u002Fproject","5.project",[208,213,218],{"title":209,"path":210,"stem":211,"icon":212},"Roadmap","\u002Fproject\u002Froadmap","5.project\u002F1.roadmap","i-lucide-map",{"title":214,"path":215,"stem":216,"icon":217},"Contributing","\u002Fproject\u002Fcontributing","5.project\u002F2.contributing","i-lucide-git-pull-request",{"title":219,"path":220,"stem":221,"icon":222},"Security","\u002Fproject\u002Fsecurity","5.project\u002F3.security","i-lucide-shield",{"id":224,"title":123,"body":225,"description":438,"extension":439,"links":440,"meta":441,"navigation":442,"path":124,"seo":443,"stem":125,"__hash__":444},"docs\u002F4.decisions\u002F0003-pin-kyo-rc7-and-jdk-25.md",{"type":226,"value":227,"toc":427},"minimark",[228,233,237,241,244,248,300,304,332,336,370,374,405,409],[229,230,232],"h2",{"id":231},"status","Status",[234,235,236],"p",{},"Accepted",[229,238,240],{"id":239},"date","Date",[234,242,243],{},"2026-09-30 (the toolchain, second round); 2026-10-11 (the pin, D-19, gate 0).",[229,245,247],{"id":246},"context","Context",[249,250,251,260,263,271,294,297],"ul",{},[252,253,254,255,259],"li",{},"Kyo 1.0.0-RC7 needs JDK 25 to compile and to run: its macros load Kyo classes (class file version 69). An sbt on JDK 21 fails with ",[256,257,258],"code",{},"UnsupportedClassVersionError",".",[252,261,262],{},"Scala 3.9.0 is the LTS line, and Kyo RC7 is built with it.",[252,264,265,266,270],{},"The runner copies rules that kyo-ui keeps private: the key dispatch and the region walk (",[267,268,269],"a",{"href":128},"ADR 0004","). A change of these rules in a new kyo-ui version changes the behaviour without a compile error.",[252,272,273,274,277,278,281,282,285,286,289,290,293],{},"Spike S3 (W0, 2026-10-09) compared RC5, RC6 and RC7. RC5 to RC6 changed a dispatch rule (",[256,275,276],{},"stopPropagation",", ",[256,279,280],{},"keepBubbling","; opt-in). RC6 to RC7 changed a region rule (",[256,283,284],{},"walkStatic",": a bound element at the root of a ",[256,287,288],{},"Reactive"," or ",[256,291,292],{},"Foreach"," becomes its own region; a new default). 11 and 16 names changed on the guard surface; all were additions.",[252,295,296],{},"By the gate words this was NO-GO for \"bump freely\": rules change between release candidates.",[252,298,299],{},"The guard of S3 (a shape hash of the TASTy, not a raw hash: the raw hash gave 8 false alarms) found both rule changes, 27 of 27 names and 14 of 14 mutants, with 0 false alarms.",[229,301,303],{"id":302},"decision","Decision",[249,305,306,313,316,329],{},[252,307,308,309,312],{},"Kyo, kyo-ui and the Kyo modules stay at 1.0.0-RC7 for the first release (",[256,310,311],{},"project\u002FVersions.scala","). D-19 (b).",[252,314,315],{},"JDK 25, Scala 3.9.0 and sbt 1.13.0 are the toolchain. The change of one of them happens in all modules at once.",[252,317,318,319,277,322,325,326,259],{},"A tasty-query surface guard (",[256,320,321],{},"KyoUiSurfaceTest",[256,323,324],{},"kyo-ui-surface.txt",") pins each kyo-ui member and rule that the runner reads. A Kyo bump is its own change, with the guard diff and ",[256,327,328],{},"Compatibility.None",[252,330,331],{},"The JMH jars that kyo-kernel RC7 lists in compile scope are excluded from every module (3.0 MB that no run loads).",[229,333,335],{"id":334},"alternatives-considered","Alternatives considered",[249,337,338,345,355,361],{},[252,339,340,344],{},[341,342,343],"strong",{},"Bump Kyo freely, with the guard as the only check"," (D-19 a). It was the recommendation if G3 was GO or SOFT. It lost because G3 was NO-GO: a release candidate can change a default rule.",[252,346,347,350,351,354],{},[341,348,349],{},"Wait for Kyo 1.0 final."," Not recorded as an option. The release of tui4s is an RC while Kyo is an RC (",[267,352,353],{"href":168},"ADR 0014",").",[252,356,357,360],{},[341,358,359],{},"JDK 21."," Not possible: Kyo RC7 does not run on it.",[252,362,363,366,367,354],{},[341,364,365],{},"Keep the JMH dependency."," It lost: no class of the seven jars loads in a class-load log of two apps. An upstream draft asks Kyo to fix the POM (",[267,368,369],{"href":188},"ADR 0019",[229,371,373],{"id":372},"consequences","Consequences",[249,375,376,379,382,385,398],{},[252,377,378],{},"Good: the copied rules match one known kyo-ui. The guard fails when a pinned name or rule changes, so a bump is a visible, reviewed step.",[252,380,381],{},"Good: kyo-ui adds 7 jars and 15.0 MB, and the first frame stays under 1 s (S4: 866 to 919 ms median).",[252,383,384],{},"Bad: every user of tui4s needs JDK 25. The README and the start scripts say so.",[252,386,387,388,391,392,395,396,259],{},"Bad: tui4s inherits the RC7 bugs: the ",[256,389,390],{},"Signal.observe"," leak and the lost wakeup (",[267,393,394],{"href":132},"ADR 0005","), and the web bugs of ",[267,397,369],{"href":188},[252,399,400,401,404],{},"Bad: a Kyo bump changes the binary API of all modules (",[256,402,403],{},"project\u002F"," marks all modules unreleased).",[229,406,408],{"id":407},"references","References",[249,410,411,414,417,420],{},[252,412,413],{},"Decision log: second round; eighth round (D-19 yes).",[252,415,416],{},"Plan: D-18, D-19; gates.md G3 (S3), G4 (S4).",[252,418,419],{},"Upstream draft: kyo-kernel JMH in compile scope.",[252,421,422,423,426],{},"CONTRIBUTING.md: \"Toolchain\", \"Dependencies and versions\"; the rule on ",[256,424,425],{},"private[kyo]"," (RR N9). ",{"title":428,"searchDepth":429,"depth":429,"links":430},"",2,[431,432,433,434,435,436,437],{"id":231,"depth":429,"text":232},{"id":239,"depth":429,"text":240},{"id":246,"depth":429,"text":247},{"id":302,"depth":429,"text":303},{"id":334,"depth":429,"text":335},{"id":372,"depth":429,"text":373},{"id":407,"depth":429,"text":408},"Kyo and kyo-ui stay at 1.0.0-RC7 for the first release, on JDK 25 and Scala 3.9.0, and a tasty-query surface guard pins the kyo-ui members that the runner reads.","md",null,{},true,{"title":123,"description":438},"h1WKrkD829dwJqAxXpvcCPbtHKw3NkwL-X0fiMjkhVs",[446,448],{"title":119,"path":120,"stem":121,"description":447,"children":-1},"jatatui 0.31.0 (a Java port of ratatui) with its crossterm JNI library is the terminal backend; tui-scala never goes on the classpath.",{"title":127,"path":128,"stem":129,"description":449,"children":-1},"The runner calls no private[kyo] member and uses no reflection; where kyo-ui keeps a rule private, the runner copies its semantics and the surface guard pins what it reads.",1792528755863]