6.3.4 / 2022-05-19

• fix(schema): disallow using schemas with schema-level projection with map subdocuments #11698
• fix(document): avoid setting nested paths to null when they're undefined #11723
• fix: allow using comment with findOneAndUpdate(), count(), distinct() and hint with findOneAndUpdate() #11793
• fix(document): clean modified subpaths when setting nested path to null after modifying subpaths #11764
• fix(types): allow calling deleteModel() with RegExp in TypeScript #11812
• docs(typescript): add section on PopulatedDoc to TypeScript populate docs #11685