- Added
Object.prototype.__proto__
polyfill- It's optional, legacy, and in some cases (mainly because of developers' mistakes) can cause problems, but some libraries depend on it, and most code can't work without the proper libraries' ecosystem
- Only for modern engines where this feature is missed (like Deno), it's not installed in IE10- since here we have no proper way setting of the prototype
- Without fixes of early implementations where it's not an accessor since those fixes are impossible
- Only for the global version
- Considering
document.all
as an object in some missed cases, see ECMAScript Annex B 3.6 - Avoiding unnecessary promise creation and validation result in
%WrapForValid(Async)IteratorPrototype%.return
, proposal-iterator-helpers/215 - Fixed omitting the result of proxing
.return
in%IteratorHelperPrototype%.return
, #1116 - Fixed the order creation of properties of iteration result object of some iterators (
value
should be created beforedone
) - Fixed some cases of Safari < 13 bug - silent on non-writable array
.length
setting - Fixed
ArrayBuffer.length
in V8 ~ Chrome 27- - Relaxed condition of re-usage native
WeakMap
for internal states with multiplecore-js
copies - Availability cloning of
FileList
in thestructuredClone
polyfill extended to some more old engines versions - Some stylistic changes and minor fixes
- Throwing a
TypeError
incore-js-compat
/core-js-builder
in case of passing invalid module names / filters for avoiding unexpected result, related to #1115 - Added missed NodeJS 13.2 to
esmodules
core-js-compat
/core-js-builder
target - Added Electron 21 compat data mapping
- Added Oculus Browser 23.0 compat data mapping