What's Changed

• Adds structuredClone polyfill by @CheloXL #1270
• Adds Element.prototype.replaceChildren polyfill by @mhassan1 #1266
• Fixes key collisions in internal Map storage #1275

New Contributors

• @CheloXL made their first contribution in https://github.com/Financial-Times/polyfill-library/pull/1242

Full Changelog: https://github.com/Financial-Times/polyfill-library/compare/v4.6.0...v4.7.0