Sourced from mongoose's changelog.

5.12.4 / 2021-04-15

• fix: upgrade mongodb driver -> 3.6.6 #10079
• fix: store fields set with select:false at schema-level when saving a new document #10101 ptantiku
• fix(populate): avoid turning already populated field to null when populating an existing lean document #10068 IslandRhythms
• fix(populate): correctly populate lean subdocs with _id property #10069
• fix(model): insertedDocs may contain docs that weren't inserted #10098 olnazx
• fix(schemaType): make type Mixed cast error objects to pojos #10131 AbdelrahmanHafez
• fix(populate): support populating embedded discriminators in nested arrays #9984
• fix(populate): handle populating map paths using trailing .$* #10123
• fix(populate): allow returning primitive from transform() function for single conventional populate #10064
• fix(index.d.ts): allow generic classes of T to use T & Document internally #10046
• fix(index.d.ts): allow $pull with $ paths #10075
• fix(index.d.ts): use correct Date type for $currentDate #10058
• fix(index.d.ts): add missing asyncInterator to Query type def #10094 borfig
• fix(index.d.ts): allow RHS of $unset properties to be any value #10066
• fix(index.d.ts): allow setting SchemaType index property to a string #10077
• refactor(index.d.ts): move discriminator() to common interface #10109 LoneRifle

5.12.3 / 2021-03-31

• fix: avoid setting schema-level collation on text indexes #10044 IslandRhythms
• fix(query): add writeConcern() method to avoid writeConcern deprecation warning #10009
• fix(connection): use queueing instead of event emitter for createCollection() and other helpers to avoid event emitter warning #9778
• fix(connection): scope Connection#id to Mongoose instance so id always lines up with mongoose.connections index #10025 IslandRhythms
• fix: avoid throwing in promiseOrCallback() if 3rd param isn't an EventEmitter #10055 emrebass
• fix(index.d.ts): add Model as 2nd generic param to Model.discriminator() #10054 coro101
• fix(index.d.ts): add docs to next() callback for pre('insertMany') hooks #10078 #10072 pezzu
• fix(index.d.ts): add transform to PopulateOptions interface #10061
• fix(index.d.ts): add DocumentQuery type for backwards compatibility #10036

5.12.2 / 2021-03-22

• fix(QueryCursor): consistently execute post('find') hooks with an array of docs #10015 #9982 IslandRhythms
• fix(schema): support setting ref as an option on an array SchemaType #10029
• fix(query): apply schema-level select option from array schematypes #10029
• fix(schema): avoid possible prototype pollution with Schema() constructor #10035 zpbrent
• fix(model): make bulkWrite skip timestamps with timestamps: false #10050 SoftwareSing
• fix(index.d.ts): make query methods return QueryWithHelpers so query helpers pass through chaining #10040
• fix(index.d.ts): add upserted array to updateOne(), updateMany(), update() result #10042
• fix(index.d.ts): add back Aggregate#project() types that were mistakenly removed in 5.12.0 #10043
• fix(index.d.ts): always allow setting type in Schema to a SchemaType class or a Schema instance #10030
• docs(transactions): introduce session.withTransaction() before session.startTransaction() because withTransaction() is the recommended approach #10008
• docs(mongoose+browser): fix broken links to info about mongoose.Types #10016

5.12.1 / 2021-03-18

• fix: update mongodb -> 3.6.5 to fix circular dependency warning #9900
• fix(document): make toObject() use child schema flattenMaps option by default #9995
• fix(ObjectId): make isValidObjectId() check that length 24 strings are hex chars only #10010 #9996 IslandRhythms

... (truncated)

• 725d6c6 chore: release 5.12.4
• a302ba6 Merge pull request #10119 from Automattic/gh-10068
• 00d836d Merge branch 'master' into gh-10068
• f5a3a01 linter fix
• 1a77624 Merge pull request #10137 from Automattic/quick-shave
• 245ef23 Merge branch 'master' into gh-10068
• c919931 made requested changes
• 2736bcf removed a redundant if statement
• 7ec2c7c might have fixed it
• 39fb5b3 Merge pull request #10131 from AbdelrahmanHafez/gh-10126
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