…on types

This fixes an issue where `InferDefaults` fails to handle union types with base types and array or object types.

`TS2322: Type 'number' is not assignable to type '((props: Readonly<{ foo: number | number[]; }>) => number | number[]) | undefined'.`
would throw for
```ts
withDefault(
  defineProps<{ foo: number | number[] }>(),
  { foo: 123 },
)
```

This adds handling of base types and array or object types separately, so that both types can exist in prop type unions.