• Minimal PHP version is 8.0
• Composited keys
• 'Joined Table Inheritance' and 'Single Table Inheritance'
• Added ProxyMapper (Cycle\Orm\Mapper\Mapper)
• Supporting for arrays/Doctrine/Laravel or custom collections in HasMany and ManyToMany relations
• Typecasting moved to Mappers
• Added Typecast handlers with Castable/Uncastable interfaces
• Added Entity Manager and Unit Of Work instead of Cycle\ORM\Transaction
• A lot of Interfaces are changed