Issues

An own property shadowing a native method is IGNORED on Map/Set/RegExp/Date/Array — `m.get = () => x; m.get()` runs the native method (wrong value, plain JS, on main)

bug

#10943

· proggeramlug opened

on Sep 22, 2026

A keyless shape reads as "no own properties" to a long tail of consumers — the class fix is ShapeObjectKind::Dictionary (#10868 step 2.5)

bug

#10942

· proggeramlug opened

on Sep 22, 2026

gc/tests/support.rs: alloc_{nursery,old}_test_object(0) allocates ZERO inline slots — a named-property write lands in the next cell

bug

#10941

· proggeramlug opened

on Sep 22, 2026

Keys-array elements copied at a hand-computed `header + 8` in four places — SIGSEGV during collection on a grow-forward or reserved-floor array

bug

#10939

· proggeramlug opened

on Sep 22, 2026

correctness: a declared-`number` + chain (number[] elements, `this` fields) reads all operands before the adds — the SECOND entry into the fused fold, not #10904's dynamic one

#10937

· proggeramlug opened

on Sep 22, 2026

perry/ui: no API to set a TextField's cursor/selection range (or opt out of select-all on focus)

#10934

· steinybot opened

on Sep 21, 2026

Object.freeze/seal/preventExtensions write flag bits into (value-8) for values with no GcHeader: segfault on the namespace stub, silent wild write on registered symbols

#10933

· proggeramlug opened

on Sep 21, 2026

perf(gc): 88% of a real TypeScript transpile is GC — 244 full collections per transpileModule, because #7937's absolute old-reclaim arm re-arms after every collection (a ~42 MiB live set parked just under the 48 MiB threshold)

#10928

· proggeramlug opened

on Sep 21, 2026

String(arrayBuffer) returns the buffer bytes instead of [object ArrayBuffer] (also SharedArrayBuffer)

#10927

· proggeramlug opened

on Sep 21, 2026

AsyncHook / AsyncResource handles have no GcHeader: JSON.stringify gives []/"" instead of {}, String() is build-dependent

#10926

· proggeramlug opened

on Sep 21, 2026

SharedArrayBuffer has no GcHeader: writing a SAB's own bytes changes Array.isArray/String/Object.keys on another SAB, and Map.prototype.get.call segfaults

#10925

· proggeramlug opened

on Sep 21, 2026

perf/census: on a real tsc compile, the shape side removes at most 16% of guarded + ARITHMETIC diamonds by site (0% by execution) - this measures arithmetic only, not object access

#10922

· proggeramlug opened

on Sep 21, 2026

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All issues

An own property shadowing a native method is IGNORED on Map/Set/RegExp/Date/Array — `m.get = () => x; m.get()` runs the native method (wrong value, plain JS, on main)

A keyless shape reads as "no own properties" to a long tail of consumers — the class fix is ShapeObjectKind::Dictionary (#10868 step 2.5)

gc/tests/support.rs: alloc_{nursery,old}_test_object(0) allocates ZERO inline slots — a named-property write lands in the next cell

Keys-array elements copied at a hand-computed `header + 8` in four places — SIGSEGV during collection on a grow-forward or reserved-floor array

correctness: a declared-`number` + chain (number[] elements, `this` fields) reads all operands before the adds — the SECOND entry into the fused fold, not #10904's dynamic one

perry/ui: no API to set a TextField's cursor/selection range (or opt out of select-all on focus)

Object.freeze/seal/preventExtensions write flag bits into (value-8) for values with no GcHeader: segfault on the namespace stub, silent wild write on registered symbols

perf(gc): 88% of a real TypeScript transpile is GC — 244 full collections per transpileModule, because #7937's absolute old-reclaim arm re-arms after every collection (a ~42 MiB live set parked just under the 48 MiB threshold)

String(arrayBuffer) returns the buffer bytes instead of [object ArrayBuffer] (also SharedArrayBuffer)

AsyncHook / AsyncResource handles have no GcHeader: JSON.stringify gives []/"" instead of {}, String() is build-dependent

SharedArrayBuffer has no GcHeader: writing a SAB's own bytes changes Array.isArray/String/Object.keys on another SAB, and Map.prototype.get.call segfaults

perf/census: on a real tsc compile, the shape side removes at most 16% of guarded + ARITHMETIC diamonds by site (0% by execution) - this measures arithmetic only, not object access

Uh oh!

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