A one liner generally cannot take Everything into account. Since code may one day be reused in something else, something like my first snippet will work for the current problem but will be broken for others.

My second snippet (with Data::Dumper) will work for most common problems of the copy type since it expands absolutely everything before recreating the structure. However using eval makes it likely to be slow, possibly insecure and less reliable.

I suggest you have a good look at this article which provides a furthur in depth discussion of deep copying (which is what we are talking about here).