6.4.6 / 2022-07-20

• fix(schema): disallow setting proto when creating schema with dotted properties #12085
• fix(document): avoid mutating original object passed to $set() when applying defaults to nested properties #12102
• fix(query): apply lean transform option to top-level document #12093
• docs(migrating_to_6): correct example for isObjectIdOrHexString() #12123 LokeshKanumoori