## invertString · function

Creates a new string that has the opposite sort order compared to the input string.

This is achieved by flipping the bits of each character code in the input string.
The resulting string is intended for use as a sort key, particularly with the
`makeKey` function in `onEach`, to achieve a descending sort order.

**Warning:** The output string will likely contain non-printable characters or
appear as gibberish and should not be displayed to the user.

**Signature:** `(input: string) => string`

**Parameters:**

- `input: string` - The string whose sort order needs to be inverted.

**Returns:** A new string that will sort in the reverse order of the input string.

**Examples:**

```typescript
const $users = A.proxy([
    { id: 1, name: 'Charlie', score: 95 },
    { id: 2, name: 'Alice', score: 100 },
    { id: 3, name: 'Bob', score: 90 },
]);

A.onEach($users, ($user) => {
    A(`p#${$user.name}: ${$user.score}`);
}, ($user) => A.invertString($user.name)); // Reverse alphabetic order
```