v3.21.1

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• Added a bugfix for the WebKit Array.prototype.{ groupBy, groupByToMap } implementation
• core-js-compat targets parser transforms engine names to lower case
• atob / btoa marked as fixed in NodeJS 17.5
• Added Electron 18.0 compat data mapping
• Added Deno 1.20 compat data mapping

v3.21.0

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• Added Base64 utility methods:
  • atob
  • btoa
• Added the proper validation of arguments to some methods from web standards
• Forced replacement of all features from early-stage proposals for avoiding possible web compatibility issues in the future
• Added Rhino 1.7.14 compat data
• Added Deno 1.19 compat data mapping
• Added Opera Android 66 and 67 compat data mapping
• Added iOS Safari 15.3 and 15.4 compat data mapping

v3.20.3

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• Detects and replaces broken third-party Function#bind polyfills, uses only native Function#bind in the internals
• structuredClone should throw an error if no arguments passed
• Changed the structure of notes in __core-js_shared__