Challenges in Creating Discriminated Unions with Schema Classes

const Circle = Schema.Struct({ radius: Schema.Number })
const Square = Schema.Struct({ sideLength: Schema.Number })
const DiscriminatedShape = Schema.Union(
  Circle.pipe(Schema.attachPropertySignature("kind", "circle")),
  Square.pipe(Schema.attachPropertySignature("kind", "square"))
)

class Circle extends Schema.Class<Circle>('Circle')({ radius: Schema.Number })  {}
class Square extends Schema.Class<Square>('Square')({ sideLength: Schema.Number })  {}
const DiscriminatedShape = Schema.Union(
  Circle.pipe(Schema.attachPropertySignature("kind", "circle")),
  Square.pipe(Schema.attachPropertySignature("kind", "square"))
)

Property '[TypeId]' is missing in type 'Circle' but required in type 'Variance<Circle, { readonly radius: number; }, never>'.