8.19.4 / 2025-11-14

• fix(schema): avoid throwing error on array of unions #15720 #15718
• fix: store original index on insertMany validation errors #15735 Jadu07
• types: correct return type of discriminator to Model #15726 twentytwo777
• docs: improve Next.js integration guide with comprehensive examples #15730 adarsh-priydarshi-5646
• docs: add documentation for Union Schema Type #15721 TechGenie-awake
• docs: removed the outdated callback and replaced them with async/await pattern #15723 hk2166
• docs: fix lingering remove() call in statics docs #15737 Gautam-Bharadwaj
• docs: fix inline doc typo in schematypes.d.ts #15738 hagid786