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不使用 `Omit` 实现 TypeScript 的 `Omit<T, K>` 泛型。

`Omit` 会创建一个省略 `K` 中字段的 `T` 对象。

例如：

```ts
interface Todo {
  title: string
  description: string
  completed: boolean
}

type TodoPreview = MyOmit<Todo, 'description' | 'title'>

const todo: TodoPreview = {
  completed: false,
}
```

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