extensio types stop being Object

main.dart

import 'dart:ui';

typedef SomethingToString<T extends Object> = void Function(T);

class Foo extends Object {
  const Foo();
}

extension type Bar(Foo foo) {}

class Baz {
  const Baz();
}

extension type MyOffset(Offset offset) {}

SomethingToString<Foo> get fooHello => (i) => 'hello';

SomethingToString<Bar> get barHello => (i) => 'hello';

SomethingToString<Baz> get bazHello => (i) => 'hello';

SomethingToString<Offset> get offsetHello => (i) => 'hello';

SomethingToString<MyOffset> get myOffsetHello => (i) => 'hello';