typedef for RadioItem does not allow `value`

When using `` in a typescript app, and you pass an object with a `value` property typescript will yell.

```js

```

The issue identifies the RadioItem typedef used by RadioGroup; start by locating that type declaration and the RadioGroup entry point. Confirm that radio objects with a value property are accepted by TypeScript without errors, while preserving the existing id and label typing.

Written by the indexing model from the issue text.