9.1.0 / 2025-12-29

• feat(model): make pathsToSave handle saving just a subpath of a modified path #15896
• feat(document+model): pass options to pre('deleteOne') and update+options to pre('updateOne') hooks #15908 #15870
• feat(versioning): optimistic concurrency exclude option, update docs for optimisticConcurrency options #15917 #15915 #15912 AbdelrahmanHafez
• feat(document): add support for getAtomics() to allow custom container types to utilize atomics #15817
• fix: add support for typescript style enums #15914 #15913 mjfwebb
• types(models): support Mongoose query casting in AnyBulkWriteOperation filter property #15918 #15910