6.6.4 / 2022-10-03

• fix(model): avoid saving applied defaults if path is deselected #12506 #12414
• fix(types): correct DocType for auto typed query helpers #12342
• fix(types): avoid "excessively deep" type instantiation error when using bulkWrite() with type that extends from document #12277
• fix(types): avoid relying on typeof this, which isn't supported in TypeScript < 4.4 #12375
• docs(schema): correct example for Schema.prototype.discriminator() #12493
• docs(typescript): clean up query helpers examples #12342
• chore: use mongodb-memory-server for testing #12262 hasezoey