Sourced from core-js's changelog.

3.31.0 - 2023.06.12

• Well-formed unicode strings proposal:
  • Methods:
    • String.prototype.isWellFormed method
    • String.prototype.toWellFormed method
  • Moved to stable ES, May 2023 TC39 meeting
  • Added es. namespace modules, /es/ and /stable/ namespaces entries
• Array grouping proposal, May 2023 TC39 meeting updates:
  • Because of the web compat issue, moved from prototype to static methods. Added:
    • Object.groupBy method
    • Map.groupBy method (with the actual semantic - with a minor difference it was present in the collections methods stage 1 proposal)
  • Demoted to stage 2
• Decorator Metadata proposal, May 2023 TC39 meeting updates:
  • Moved to stage 3
  • Added Function.prototype[Symbol.metadata] (=== null)
  • Added /actual/ entries
• Iterator Helpers stage 3 proposal:
  • Changed Symbol.iterator fallback from callable check to undefined / null check, May 2023 TC39 meeting, proposal-iterator-helpers/272
  • Removed IsCallable check on NextMethod, deferring errors to Call site, May 2023 TC39 meeting, proposal-iterator-helpers/274
• Added Promise.withResolvers stage 2 proposal:
  • Promise.withResolvers method
• Symbol predicates stage 2 proposal:
  • The methods renamed to end with Symbol, May 2023 TC39 meeting:
    • Symbol.isRegistered -> Symbol.isRegisteredSymbol method
    • Symbol.isWellKnown -> Symbol.isWellKnownSymbol method
• Added value argument of URLSearchParams.prototype.{ has, delete }, url/735
• Fixed some cases of increasing buffer size in ArrayBuffer.prototype.{ transfer, transferToFixedLength } polyfills
• Fixed awaiting async AsyncDisposableStack.prototype.adopt callback, #1258
• Fixed URLSearchParams#size in ES3 engines (IE8-)
• Added a workaround in Object.{ entries, values } for some IE versions bug with invisible integer keys on null-prototype objects
• Added TypeScript definitions to core-js-compat, #1235, thanks @​susnux
• Compat data improvements:
  • Set.prototype.difference that was missed in Bun because of a bug added in 0.6.0
  • Array.prototype.{ group, groupToMap } marked as no longer supported in WebKit runtimes because of the mentioned above web compat issue. For example, it's disabled from Bun 0.6.2
  • Methods from the change Array by copy proposal marked as supported from FF115
  • Array.fromAsync marked as supported from FF115
  • URL.canParse marked as supported from FF115
  • value argument of URLSearchParams.prototype.{ has, delete } marked as supported from NodeJS 20.2.0 and FF115
  • Added Deno 1.34 compat data mapping
  • Added Electron 26 compat data mapping
  • Added Samsung Internet 22 compat data mapping
  • Added Opera Android 75 and 76 compat data mapping
  • Added Quest Browser 27 compat data mapping

• 199c633 3.31.0
• fe4ac8a avoid some extra work
• c22285c add a workaround in Object.{ entries, values } for some IE versions bug wit...
• 38592f4 workaround IE bug
• 57dd86a fix URLSearchParams#size in ES3 engines (IE8-)
• d0db6ee optimize URLSearchParams.prototype.delete
• a7c106e add a pure version special case
• a6a0e29 add value argument of URLSearchParams.prototype.{ has, delete }
• eb18d34 drop extraction a method from an object literal since it's not a reserved wor...
• e3a7cac Array grouping proposal changes
• Additional commits viewable in compare view

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