`O.pick` types the values as `unknown`

```tsx
type Source = {
  name: string
  age: number
  email: string
  birthday: Date
}

const editableSourceKeys = ["name", "email"] as const;

const source: Source = {
  name: "John Doe",
  age: 30,
  email: "abc@abc.com",
  birthday: new Date()
}

const editableSource = O.pick(source, editableSourceKeys);

editableSource.name // unknown instead of string
```