6.4.0 / 2022-06-17

• feat: upgrade mongodb driver -> 4.7.0 #11909 AbdelrahmanHafez
• feat(types+document): add $assertPopulated() for working with manually populated paths in TypeScript #11843
• feat(mongoose): add setDriver() function to allow overwriting driver in a more consistent way #11900
• feat(types): add helpers to infer schema type automatically #11563 mohammad0-0ahmad
• feat: add transform option to lean() #10423 IslandRhythms
• feat(base): add support to set default immutable for createdAt globally #11888 AbdelrahmanHafez
• fix: make doValidate() on document array elements run validation on the whole subdoc #11902
• feat(types): add expression typings to Aggregate stages #11370 Uzlopak
• fix: remove on from schema reserved keys #11580 IslandRhythms