Sourced from core-js's changelog.

3.8.1 - 2020.12.06

• Fixed work of new %TypedArray% methods on BigInt arrays
• Added ESNext methods to ES3 workaround for Number constructor wrapper

3.8.0 - 2020.11.26

• Added relative indexing method stage 3 proposal
  • Array#at
  • %TypedArray%#at
• Added Number.range stage 1 proposal
  • Number.range
  • BigInt.range
• Added array filtering stage 1 proposal
  • Array#filterOut
  • %TypedArray%#filterOut
• Added array deduplication stage 1 proposal
  • Array#uniqueBy
• Added code points / code units explicit feature detection in String#at for preventing breakage code which use obsolete String#at proposal polyfill
• Added the missed (es|stable)/instance/replace-all entries
• Updated compat data mapping for Opera - from Opera 69, the difference with Chrome versions increased to 14
• Compat data mapping for modern Android WebView to Chrome moved from targets parser directly to compat data
• Depracate core-js-builder blacklist option in favor of exclude

2.6.12 [LEGACY] - 2020.11.26

• Added code points / code units explicit feature detection in String#at for preventing breakage code which use obsolete String#at proposal polyfill
• Added OPEN_SOURCE_CONTRIBUTOR detection in postinstall
• Added Drone CI detection in postinstall

3.7.0 - 2020.11.06

• 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

... (truncated)

• 4645db4 3.8.1
• 78a9a24 fix work of new %TypedArray% methods on BigInt arrays
• caf5949 update eslint
• 3808b58 update dependencies
• d39ce91 update dependencies
• 440f186 update dependencies
• f032dd8 update dependencies
• 49d7978 update dependencies
• 79daf40 add ESNext methods to ES3 workaround for Number constructor wrapper
• 1d24b54 update qunit
• Additional commits viewable in compare view

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