9.10.3 / 2026-09-29

• fix(model): preserve unsaved documents after ordered bulkSave errors #16533 #16532 IbrahimHafez1
• fix(model): don't mutate the caller's update object in bulkWrite updateMany #16526 fadiroot
• fix(schema): run setters declared on the union path itself #16528 giaBaoJS
• fix(collection): open collection if connection was already opened #16527 #16525 #16524
• fix(query+model): replace {MODEL} in cast error messages from update and bulkWrite casting #16529 #16502 #16480