Reflection class properties lose their optional information for mapped types

[marcus-sa]

interface User {
  readonly id: integer;
  readonly name?: string;
}

const reflectionClass = ReflectionClass.from<User>();
console.log(reflectionClass.getProperty('name').isOptional()) // true

type User2 = Pick<
  User,
  'id' | 'name'
>;

const reflectionClass = ReflectionClass.from<User2>();
console.log(reflectionClass.getProperty('name').isOptional()) // false