• String#replaceAll moved to the stable ES, per June TC39 meeting
• Promise.any and AggregateError moved to the stable ES, per July TC39 meeting
• Added Reflect[@@toStringTag], per July TC39 meeting
• Forced replacement of Array#{ reduce, reduceRight } in Chrome 80-82 because of a bug, #766
• Following the changes in the upsert proposal, { Map, WeakMap }#emplace replace { Map, WeakMap }#upsert, these obsolete methods will be removed in the next major release
• By the current spec, AggregateError#errors is own data property
• Added correct iteration closing in the iteration helpers according to the current version of the proposal
• process.nextTick have a less priority when Promise in the microtask implementation, #855
• Fixed microtask implementation in engines with MutationObserver, but without document, #865, #866
• Fixed core-js-builder with an empty (after the targets engines or another filtration) modules list, #822
• Fixed possible twice call of window.onunhandledrejection, #760
• Fixed some possible problems related multiple global copies of core-js, #880
• Added a workaround for 3rd party Reflect.set polyfill bug, #847
• Updated compat data:
  • Chrome up to 86
  • FF up to 82
  • Safari up to 14
• Updated compat data mapping:
  • iOS up to 14
  • NodeJS up to 15.0
  • Electron up to 11.0
  • Samsung Internet up to 13.0
  • Opera Android up to 60
  • The rest automatically
• Updated all required dependencies