`jackson-databind`'s `PolymorphicTypeValidator` (PTV) is the primary safety mechanism guarding polymorphic deserialization. When polymorphic typing is enabled and a type identifier contains generic parameters (i.e. the type ID string contains `<`), `DatabindContext._resolveAndValidateGeneric()` validates **only the raw container class name** (the substring before `<`) against the configured PTV. If the container type is approved, the method parses the full canonical type string via `TypeFactory