Sourced from mongoose's changelog.

5.12.13 / 2021-06-04

• perf(document): avoid creating nested paths when running $getAllSubdocs() #10275
• fix: make returnDocument option work with findOneAndUpdate() #10232 #10231 cnwangjie
• fix(document): correctly reset subdocument when resetting a map subdocument underneath a single nested subdoc after save #10295
• perf(query): avoid setting non-null sessions to avoid overhead from $getAllSubdocs() #10275
• perf(document): pre split schematype paths when compiling schema to avoid extra overhead of splitting when hydrating documents #10275
• perf(schema): pre-calculate mapPaths to avoid looping over every path for each path when initing doc #10275
• fix(index.d.ts): drill down into nested arrays when creating LeanDocument type #10293

5.12.12 / 2021-05-28

• fix(documentarray): retain atomics when setting to a new array #10272
• fix(query+model): fix deprecation warning for returnOriginal with findOneAndUpdate() #10298 #10297 #10292 #10285 IslandRhythms
• fix(index.d.ts): make map() result an array if used over an array #10288 quantumsheep

5.12.11 / 2021-05-24

• fix(populate): skip applying setters when casting arrays for populate() to avoid issues with arrays of immutable elements #10264
• perf(schematype): avoid cloning setters every time we run setters #9588
• perf(get): add benchmarks and extra cases to speed up get() #9588
• perf(array): improve array constructor performance on small arrays to improve nested array perf #9588
• fix(index.d.ts): allow using type: [String] with string[] when using SchemaDefinition with generic #10261
• fix(index.d.ts): support ReadonlyArray as well as regular array where possible in schema definitions #10260
• docs(connection): document noListener option to useDb #10278 stuartpb
• docs: migrate raw tutorial content from pug / JS to markdown #10271
• docs: fix typo #10269 sanjib

5.12.10 / 2021-05-18

• fix(query): allow setting defaults option on result documents from query options #7287 IslandRhythms
• fix(populate): handle populating embedded discriminator with custom tiedValue #10231
• fix(document): allow passing space-delimited string of pathsToValidate to validate() and validateSync() #10258
• fix(model+schema): support loadClass() on classes that have collection as a static property #10257 #10254 IslandRhythms
• fix(SchemaArrayOptions): correct property name #10236
• fix(index.d.ts): add any to all query operators to minimize likelihood of "type instantiation is excessively deep" when querying docs with 4-level deep subdocs #10189
• fix(index.d.ts): add $parent() in addition to parent() in TS definitions
• fix(index.d.ts): correct async iterator return type for QueryCursor #10253 #10252 #10251 borfig
• fix(index.d.ts): add virtualsOnly parameter to loadClass() function signature IslandRhythms
• docs(typescript): add typescript populate docs #10212
• docs: switch from AWS to Azure Functions for search #10244

5.12.9 / 2021-05-13

• fix(schema): ensure add() overwrites existing schema paths by default #10208 #10203
• fix(schema): support creating nested paths underneath document arrays #10193
• fix(update): convert nested dotted paths in update to nested paths to avoid ending up with dotted properties in update #10200
• fix(document): allow calling validate() and validateSync() with options as first parameter #10216
• fix(schema): apply static properties to model when using loadClass() #10206
• fix(index.d.ts): allow returning Promise from middleware functions #10229

... (truncated)

• 5ccea27 chore: release 5.12.13
• fd954e1 fix(document): make #10295 fix more durable
• 78aa2a3 fix(document): correctly reset subdocument when resetting a map subdocument u...
• 73f399e test(document): repro #10295
• 5c936e9 fix(index.d.ts): drill down into nested arrays when creating LeanDocument type
• 12111c5 perf(document): avoid creating nested paths when running $getAllSubdocs()
• 26c65c0 perf(document): avoid unnecessary split in get()
• 601c06d fix: fix tests re: #10275
• 184f10f perf(query): avoid setting non-null sessions to avoid overhead from $getAllSu...
• 1badbeb perf(document): pre split schematype paths when compiling schema to avoid ext...
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