We've improved the use of WeakMap for better memory management. Please report to us if any regressions are found.

What's Changed

• feat: atomWithRefresh by @dai-shi in #2393
• refactor: make pendingMap a WeakMap for better memory management by @dai-shi in #2396
• fix(utils): make 'unwrap' and 'loadable' able to access async atom's resolved value immediately by @iwoplaza in #2417
• fix(types): withStorageValidator by @dai-shi in #2418
• build: change rollup target to ES2018 by @amirhhashemi in #2419

Full Changelog: v2.6.5...v2.7.0