/** ## Copy : 提供一个自定义克隆接口,`深度遍历`
* - clone():Copy
@example
```ts
class A implements Copy{
  constructor(public a:number){}
  clone(){ return new A(this.a) }
}
let a=new A(1)
let b=a.clone()
assert(a.a==b.a)
assert(a!=b)
```
@category Interface
*/
export interface Copy {
    clone(): Copy;
}
/** ## `implements_copy` : duck type to judge Copy type @category Interface */
export declare function implements_copy(value: unknown): value is Copy;
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