PerryTS

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

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  bug

  Difficulty 3/5 1-2 days Newbie friendliness 67/100

  PerryTS/perry#12864 · Opened Oct 18, 2026

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

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  bug

  Difficulty 2/5 1-3 hours Newbie friendliness 76/100

  PerryTS/perry#12863 · Opened Oct 18, 2026

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

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  bug

  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  PerryTS/perry#12862 · Opened Oct 18, 2026

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• collect_packages_in_node_modules walks symlinked node_modules with no visited set: 3 fully-connected workspace packages hang perry compile at Collecting modules (100% CPU, no output)

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  Difficulty 3/5 1-2 days Newbie friendliness 76/100

  PerryTS/perry#12822 · Opened Oct 18, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 56/100

  PerryTS/perry#12819 · Opened Oct 18, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  PerryTS/perry#12818 · Opened Oct 18, 2026

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

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PerryTS/perry#12744 · Opened Oct 17, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 56/100

  PerryTS/perry#12742 · Opened Oct 17, 2026

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

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PerryTS/perry#12730 · Opened Oct 17, 2026

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

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  Difficulty 3/5 1-2 days Newbie friendliness 55/100

  PerryTS/perry#12727 · Opened Oct 17, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  PerryTS/perry#12726 · Opened Oct 17, 2026

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

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  Difficulty 4/5 1-2 days Newbie friendliness 56/100

  PerryTS/perry#12725 · Opened Oct 17, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  PerryTS/perry#12724 · Opened Oct 17, 2026

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

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  Difficulty 4/5 1-2 days Newbie friendliness 55/100

  PerryTS/perry#12720 · Opened Oct 17, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 44/100

  PerryTS/perry#12710 · Opened Oct 17, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  PerryTS/perry#12709 · Opened Oct 17, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 45/100

  PerryTS/perry#12693 · 1 comment · Opened Oct 16, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  PerryTS/perry#12689 · Opened Oct 16, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 18/100

  PerryTS/perry#12669 · Opened Oct 16, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 30/100

  PerryTS/perry#12666 · Opened Oct 16, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  PerryTS/perry#12662 · Opened Oct 16, 2026

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

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  Difficulty 4/5 3-5 days Newbie friendliness 25/100

  PerryTS/perry#12652 · Opened Oct 15, 2026

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• gc-effects: checked-in tables don't describe auto-optimize archives (js_bun_gc stub throws, table says throws=no)

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  Difficulty 4/5 3-5 days Newbie friendliness 12/100

  PerryTS/perry#12646 · Opened Oct 15, 2026

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• 5c follow-up: route non-constant direct eval through the prototype-write census as a dynamic write

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  Difficulty 4/5 3-5 days Newbie friendliness 18/100

  PerryTS/perry#12644 · Opened Oct 15, 2026

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• runtime: Linux handle-stack operations are out-of-line cold TLS calls (makes callers cold)

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  Difficulty 5/5 Over a week Newbie friendliness 15/100

  PerryTS/perry#12641 · Opened Oct 15, 2026

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• object model step 1: narrow the Object.create family census (freeze/relink/unnamed define) to reachable targets

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  Difficulty 5/5 Over a week Newbie friendliness 12/100

  PerryTS/perry#12640 · Opened Oct 15, 2026

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• Object.prototype setter does not intercept a named store on an array (arr.zz = v creates an own key)

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  PerryTS/perry#12635 · Opened Oct 15, 2026

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• Builtin prototype parity: URLSearchParams/DisposableStack default prototype, custom new.target on fetch handle types

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  Difficulty 5/5 Over a week Newbie friendliness 8/100

  PerryTS/perry#12629 · Opened Oct 14, 2026

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• Object model step 4: performance and memory regressions to win back in step 5

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  Difficulty 5/5 Over a week Newbie friendliness 8/100

  PerryTS/perry#12618 · 1 comment · Opened Oct 14, 2026

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• GC decodes a Number whose bits equal an 8-aligned heap address as a pointer (raw-or-tagged word ambiguity)

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  Difficulty 5/5 Over a week Newbie friendliness 12/100

  PerryTS/perry#12616 · Opened Oct 14, 2026

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• test_gap_repsel_element_group_numeric fails on main in every arm

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  Difficulty 3/5 1-2 days Newbie friendliness 52/100

  PerryTS/perry#12615 · Opened Oct 14, 2026

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• perf: generic own-presence probe for unknown-layout receivers (fastify +1.22%, named-array map) after step 7

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  Difficulty 4/5 3-5 days Newbie friendliness 14/100

  PerryTS/perry#12607 · Opened Oct 14, 2026

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• object model §6a: kind-2 program-symbol atoms need a traced value word in StaticAtom

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  Difficulty 5/5 Over a week Newbie friendliness 18/100

  PerryTS/perry#12606 · Opened Oct 14, 2026

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• Hono SmartRouter fallback to TrieRouter throws `undefined` natively — every request fails

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  Difficulty 4/5 3-5 days Newbie friendliness 22/100

  PerryTS/perry#12594 · Opened Oct 13, 2026

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• a.method.call(b) on a foreign class instance uses the receiver's capture environment

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  PerryTS/perry#12578 · Opened Oct 13, 2026

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• methodcert: tsc .text +75 KB from register spills at uncertified class-dispatch sites

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  Difficulty 5/5 Over a week Newbie friendliness 18/100

  PerryTS/perry#12568 · Opened Oct 13, 2026

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• P0: after honest pointers (#12529), native handles in arithmetic/ToNumeric are treated as non-objects (1/new Headers() → typeof object)

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  Difficulty 4/5 3-5 days Newbie friendliness 35/100

  PerryTS/perry#12540 · Opened Oct 13, 2026

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• jsfields fix-forward: binarytrees_plain +0.64% (check() pays one extra instruction per call; share the receiver handle across a memo run)

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  Difficulty 5/5 Over a week Newbie friendliness 8/100

  PerryTS/perry#12518 · Opened Oct 12, 2026

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• Born-old prototype births and old-arena teardown cost +0.8% on commander (no minor to amortise)

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  Difficulty 5/5 Over a week Newbie friendliness 12/100

  PerryTS/perry#12508 · Opened Oct 12, 2026

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• classsem fix-forward: fastify .text +86 KB (per-class birth-shape/name data?)

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  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  PerryTS/perry#12486 · Opened Oct 12, 2026

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• perf: string .length not typed as number, so sums go through js_dynamic_string_or_number_add (str grid 4–18× node)

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  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  PerryTS/perry#12485 · Opened Oct 12, 2026

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• Stale codegen/runtime tests failing on main: native_root_coverage::array_birth, ic_fast_split, barrier_stem_census

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  Difficulty 3/5 1-2 days Newbie friendliness 35/100

  PerryTS/perry#12481 · Opened Oct 12, 2026

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• fieldupdate fix-forward: tsc +0.62% instructions (polymorphic property RMW slow path)

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PerryTS/perry#12472 · Opened Oct 12, 2026

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• perf: GC tracing validates scanned pointers via ValidPointerSet hash lookup

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  Difficulty 4/5 1-2 days Newbie friendliness 42/100

  PerryTS/perry#12455 · Opened Oct 12, 2026

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• perf: per-allocation overhead: js_inline_arena_state (123 instr) per birth, barriers + note_black_birth on just-born objects

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  PerryTS/perry#12454 · Opened Oct 12, 2026

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• perf: typed-array element access goes through js_dyn_index_get/set with GC barrier and string check; int32 elements compared generically

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  Difficulty 4/5 3-5 days Newbie friendliness 48/100

  PerryTS/perry#12453 · Opened Oct 12, 2026

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• worker_heavy +1.58% instructions after the parentPort/agent-liveness fix (#12285)

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  Difficulty 4/5 3-5 days Newbie friendliness 42/100

  PerryTS/perry#12448 · Opened Oct 12, 2026

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• keylists fix-forward: Effect RSS +28 MB (fewer minors, ArenaBytes full trigger) after stationary canonical keys

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PerryTS/perry#12425 · Opened Oct 11, 2026

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• glob ft.set faulted once under PROTECT_FROMSPACE GC stress (OpenCode occatalog), not reproduced

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  Difficulty 5/5 Over a week Newbie friendliness 25/100

  PerryTS/perry#12408 · Opened Oct 11, 2026

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• WeakMap subclasses: wrong prototype for default subclasses; super()/new.target receivers miss the WeakMap brand

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  Difficulty 5/5 Over a week Newbie friendliness 35/100

  PerryTS/perry#12396 · Opened Oct 11, 2026

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