• Re-introduced RegExp escaping stage 2 proposal, September 2023 TC39 meeting:
  • Added RegExp.escape method with the new set of symbols for escaping
  • Some years ago, it was presented in core-js, but it was removed after rejecting the old version of this proposal
• Added ArrayBuffer.prototype.{ transfer, transferToFixedLength } and support transferring of ArrayBuffers via structuredClone to engines with MessageChannel
• Optimized Math.f16round polyfill
• Fixed some conversion cases of Math.f16round and DataView.prototype.{ getFloat16, setFloat16 }
• Fully forced polyfilling of the TC39 Observable proposal because of incompatibility with the new WHATWG Observable proposal
• Added an extra workaround of errors with exotic environment objects in Symbol polyfill, #1289
• Some minor fixes and stylistic changes
• Compat data improvements:
  • V8 unshipped Iterator helpers because of some Web compatibility issues
  • Promise.withResolvers marked as supported from V8 ~ Chrome 119
  • Array grouping proposal features marked as supported from FF119
  • value argument of URLSearchParams.prototype.{ has, delete } marked as properly supported from V8 ~ Chrome 118
  • URL.canParse and URLSearchParams.prototype.size marked as supported from Bun 1.0.2
  • Added Deno 1.37 compat data mapping
  • Added Electron 28 compat data mapping
  • Added Opera Android 78 compat data mapping