Merge train: #9736 + three commits missed by stale-head picks

changelog.d/9704-fresh-instance-prototype-replacement.md

@@ -0,0 +1,6 @@
+### Fixed
+
+- Fresh instances now observe class prototype methods replaced after class
+  registration. The method inliner keeps runtime dispatch for prototype chains
+  exposed or mutated anywhere in the module, including helper functions and
+  closures. (#9239)

changelog.d/9731-arena-right-sizing.md

@@ -14,7 +14,7 @@ stays disarmed until utilization reaches 70% or capacity grows materially
 into a periodic full-GC loop.
 
 On the compiled Claude Code 2.1.112 workload from the report, arena capacity
-fell from 96.5 MiB before the episode to 36.7 MiB, then 35.7 MiB and 35.7 MiB
-across a five-minute idle soak with about 23 MiB live. RSS fell from 401 MiB at
-the first census to 132 MiB at the last, and exactly one idle full was attributed
+fell from 96.5 MB before the episode to 36.7 MB, then 35.7 MB and 35.7 MB
+across a five-minute idle soak with about 23 MB live. RSS fell from 401 MB at
+the first census to 132 MB at the last, and exactly one idle full was attributed
 to arena right-sizing.

changelog.d/9733-uncarried-shape-descriptors.md

@@ -0,0 +1,7 @@
+**Full collections now retire shape descriptors that no live object or
+restamping cache owns.** A full trace records every shaped receiver, and a
+synchronous sweep prunes only records absent from that complete census.
+Minor and budgeted cycles remain conservative. Generated-module ids and
+shape/transition caches retain exact ownership, while unstable transition
+entries validate their target before stamping. In the claude-code census,
+uncarried descriptors without an owner fell from 34,501 to zero.

crates/perry-runtime/src/gc/arena_right_size.rs

@@ -82,7 +82,7 @@ struct ArenaRightSizeState {
     last_usage: ArenaUsage,
 }
 
-thread_local! {
+crate::perry_thread_local! {
     static STATE: RefCell<ArenaRightSizeState> =
         RefCell::new(ArenaRightSizeState::default());
     #[cfg(test)]

test-files/test_gap_9718_initializer_self_binding.ts

@@ -69,6 +69,16 @@ async function main(): Promise<void> {
   report("nested-await", () => pending[6]!());
   report("earlier-refs-later", h);
 
+  // The shapes the pre-pass's original ordering existed for. They passed
+  // before this fix and must keep passing: moving the initializer scan earlier
+  // is a superset, not a replacement.
+  const fact = (n: number): number => (n <= 1 ? 1 : n * fact(n - 1));
+  const fib = function rec(n: number): number { return n < 2 ? n : rec(n - 1) + rec(n - 2); };
+  const off = renderSync(() => off.u() + "/init-call-result");
+  console.log("self-recursive-arrow=" + fact(5));
+  console.log("named-fn-expr-recursion=" + fib(10));
+  report("init-call-result", () => pending[7]!());
+
   // The declaration is complete by the time these run, so the direct calls
   // must agree with what the closures saw.
   report("direct-plain", () => a.u());