Issues

fetch: `Response` skips constructor validation, `Headers` skips value normalization, clones ignore a disturbed body

mrhenry/polyfill-library#245 · opened

on Oct 13, 2026

structuredClone corrupts ArrayBuffer/DataView, drops RegExp flags, throws on invalid Date, ignores `transfer`, and mishandles `"proto"`

mrhenry/polyfill-library#244 · opened

on Oct 13, 2026

Event constructor rejects valid inputs, is callable without new, and ignores composed

mrhenry/polyfill-library#243 · opened

on Oct 13, 2026

Element.prototype.dataset returns a stale snapshot instead of a live DOMStringMap

mrhenry/polyfill-library#242 · opened

on Oct 13, 2026

Element.prototype.classList aborts at load when HTMLElement is undefined (IE8)

mrhenry/polyfill-library#241 · opened

on Oct 13, 2026

_DOMTokenList under-validates tokens, returns undefined from item(), and lacks value / Symbol.toStringTag / iteration

mrhenry/polyfill-library#240 · opened

on Oct 13, 2026

Element.prototype.before calls Array.prototype.indexOf without declaring a dependency

mrhenry/polyfill-library#239 · opened

on Oct 13, 2026

Element.prototype.after calls Array.prototype.indexOf without declaring a dependency

mrhenry/polyfill-library#238 · opened

on Oct 13, 2026

Element.prototype.closest throws when the SVG ancestor chain leaves the element tree

mrhenry/polyfill-library#237 · opened

on Oct 13, 2026

Element.prototype.matches fallback fails for detached nodes and does not validate its argument

mrhenry/polyfill-library#236 · opened

on Oct 13, 2026

matchMedia change listeners never fire (reads `.listeners` off the `addListener` function)

mrhenry/polyfill-library#235 · opened

on Oct 13, 2026

GetSetRecord throws TypeError instead of RangeError for a negative size

mrhenry/polyfill-library#234 · opened

on Oct 13, 2026

Promise.allSettled escapes synchronously and skips IteratorClose when C.resolve throws

mrhenry/polyfill-library#233 · opened

on Oct 13, 2026

Promise.any escapes synchronously and skips IteratorClose when C.resolve throws

mrhenry/polyfill-library#232 · opened

on Oct 13, 2026

Promise (vendored Yaku) exposes the wrong observable shape and ignores species

mrhenry/polyfill-library#231 · opened

on Oct 13, 2026

WeakSet constructor swallows GetIterator failure for non-iterables

mrhenry/polyfill-library#230 · opened

on Oct 13, 2026

WeakMap constructor swallows GetIterator failure for non-iterables

mrhenry/polyfill-library#229 · opened

on Oct 13, 2026

Map constructor swallows GetIterator failure for non-iterables

mrhenry/polyfill-library#228 · opened

on Oct 13, 2026

Map.prototype.set throws TypeError for native Symbol keys

mrhenry/polyfill-library#227 · opened

on Oct 13, 2026

Symbol.prototype.description returns the internal uid on engines with computed method names

mrhenry/polyfill-library#226 · opened

on Oct 13, 2026

Object.values snapshots keys, so a getter that deletes a later key still yields a value

mrhenry/polyfill-library#225 · opened

on Oct 13, 2026

Object.assign drops symbol keys and silently ignores non-writable / non-extensible targets

mrhenry/polyfill-library#224 · opened

on Oct 13, 2026

AggregateError ships the wrong instance/prototype shape

mrhenry/polyfill-library#223 · opened

on Oct 13, 2026

Error.isError accepts fake errors and throws on revoked proxies

mrhenry/polyfill-library#222 · opened

on Oct 13, 2026

Reflect.set ignores the receiver and prototype chain, returns the wrong boolean, and writes to the target

mrhenry/polyfill-library#221 · opened

on Oct 13, 2026

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Issues

fetch: `Response` skips constructor validation, `Headers` skips value normalization, clones ignore a disturbed body

structuredClone corrupts ArrayBuffer/DataView, drops RegExp flags, throws on invalid Date, ignores `transfer`, and mishandles `"proto"`

Event constructor rejects valid inputs, is callable without new, and ignores composed

Element.prototype.dataset returns a stale snapshot instead of a live DOMStringMap

Element.prototype.classList aborts at load when HTMLElement is undefined (IE8)

_DOMTokenList under-validates tokens, returns undefined from item(), and lacks value / Symbol.toStringTag / iteration

Element.prototype.before calls Array.prototype.indexOf without declaring a dependency

Element.prototype.after calls Array.prototype.indexOf without declaring a dependency

Element.prototype.closest throws when the SVG ancestor chain leaves the element tree

Element.prototype.matches fallback fails for detached nodes and does not validate its argument

matchMedia change listeners never fire (reads `.listeners` off the `addListener` function)

GetSetRecord throws TypeError instead of RangeError for a negative size

Promise.allSettled escapes synchronously and skips IteratorClose when C.resolve throws

Promise.any escapes synchronously and skips IteratorClose when C.resolve throws

Promise (vendored Yaku) exposes the wrong observable shape and ignores species

WeakSet constructor swallows GetIterator failure for non-iterables

WeakMap constructor swallows GetIterator failure for non-iterables

Map constructor swallows GetIterator failure for non-iterables

Map.prototype.set throws TypeError for native Symbol keys

Symbol.prototype.description returns the internal uid on engines with computed method names

Object.values snapshots keys, so a getter that deletes a later key still yields a value

Object.assign drops symbol keys and silently ignores non-writable / non-extensible targets

AggregateError ships the wrong instance/prototype shape

Error.isError accepts fake errors and throws on revoked proxies

Reflect.set ignores the receiver and prototype chain, returns the wrong boolean, and writes to the target