Since v4.0.3 the validation needs to be explicitly enabled via
validate: true. It has performance implications and usually should not be needed, as long as you don't modify your entities via
MirkoORM will validate your properties before actual persisting happens. It will try to fix wrong
data types for you automatically. If automatic conversion fails, it will throw an error. You can
enable strict mode to disable this feature and let ORM throw errors instead. Validation is triggered
when persisting the entity.