Issues

• Type-only class cycle throws "Super constructor is not a constructor" without inheritance

  PerryTS/perry#12889 · Filter by author DoctorGester opened on Oct 19, 2026

• URL: dot segments (. and ..) are not removed from the pathname

  bug
  PerryTS/perry#12864 · Filter by author lukas-kuna opened on Oct 18, 2026

• Every program panics at startup on kernels without transparent huge pages (madvise MADV_NOHUGEPAGE returns EINVAL)

  bug
  PerryTS/perry#12863 · Filter by author lukas-kuna opened on Oct 18, 2026

• fetch(): with keep-alive and a small response, every call keeps a Web Streams handle id; the process aborts after ~1M calls

  bug
  PerryTS/perry#12862 · Filter by author lukas-kuna opened on Oct 18, 2026

• crypto.getRandomValues(Int32Array) does not fill the array and returns a different object

  PerryTS/perry#12819 · Filter by author lagz0ne opened on Oct 18, 2026

• Inherited arrow-function class field calling this.<other field>() throws 'value is not a function' when the base class is in another module

  PerryTS/perry#12818 · Filter by author lagz0ne opened on Oct 18, 2026

• gc-effects: sidecar for the runtime copy inside the Android/watchOS/visionOS UI library

  PerryTS/perry#12744 · Filter by author proggeramlug opened on Oct 17, 2026

• ArrayPush(N): local not in scope when pushing onto a const array initialised with an object literal (blocks TanStack Router SSR)

  PerryTS/perry#12742 · Filter by author kaitk opened on Oct 17, 2026

• fastify +0.62% after optimization round 1: by-name reads on family objects take generic slow paths

  PerryTS/perry#12730 · Filter by author proggeramlug opened on Oct 17, 2026

• util.MIMEParams keeps _entries by name with attributes in a side table

  PerryTS/perry#12727 · Filter by author proggeramlug opened on Oct 17, 2026

• class X extends URLSearchParams instances carry a by-name __perry_usp_backing__ key

  PerryTS/perry#12726 · Filter by author proggeramlug opened on Oct 17, 2026

• URLSearchParams.prototype differs from node: enumerability, key order, extra toLocaleString/valueOf, missing Symbol.iterator

  PerryTS/perry#12725 · Filter by author proggeramlug opened on Oct 17, 2026

• fastify +0.41% instructions after #12722 (URLSearchParams private slots, spread/rest private skip)

  PerryTS/perry#12724 · Filter by author proggeramlug opened on Oct 17, 2026

• perf: layout probe declines functions with accessors (Array.isBuffer via Symbol.species)

  PerryTS/perry#12720 · Filter by author proggeramlug opened on Oct 17, 2026

• Calling Function.prototype() throws "not a function"

  PerryTS/perry#12719 · Filter by author proggeramlug opened on Oct 17, 2026

• The Object constructor owns non-spec toString / valueOf

  PerryTS/perry#12718 · Filter by author proggeramlug opened on Oct 17, 2026

• Object-literal methods own a prototype and are constructible

  PerryTS/perry#12717 · Filter by author proggeramlug opened on Oct 17, 2026

• Null-prototype NativeNamespace receivers for http response once:close/on:finish (~42k slow reads in fastify)

  PerryTS/perry#12710 · Filter by author proggeramlug opened on Oct 17, 2026

• qs_parse +0.37% instructions after 3b-ii stream/events layouts (#12708)

  PerryTS/perry#12709 · Filter by author proggeramlug opened on Oct 17, 2026

• Nondeterministic codegen: Next.js app-page-turbo.runtime.prod.js and server.js objects differ between identical compiles

  PerryTS/perry#12693 · Filter by author proggeramlug opened on Oct 16, 2026
  1

• object model 3a part 2: http/stream instance fields (_header, _events, destroyed) walk the prototype chain (~106k walks per fastify run)

  PerryTS/perry#12689 · Filter by author proggeramlug opened on Oct 16, 2026

• Typed WeakMap receivers ignore own get, setPrototypeOf and a patched WeakMap.prototype.get

  PerryTS/perry#12669 · Filter by author proggeramlug opened on Oct 16, 2026

• NumberAtReadFlow: catch starts from the try's entry state, so a non-Number write before a throw is not seen in the catch (suspected)

  PerryTS/perry#12666 · Filter by author proggeramlug opened on Oct 16, 2026

• number_by_construction: NumberAtReadFlow ignores a break out of a labeled block (prints undefined, node NaN)

  PerryTS/perry#12662 · Filter by author proggeramlug opened on Oct 16, 2026

• 4 GC-corpus gap fixtures fail node parity on main (URL pathname set, NextRequest query, native call path arg, numeric element group)

  PerryTS/perry#12652 · Filter by author proggeramlug opened on Oct 15, 2026