* copy
* address comments
* remove unused functions, reuse http clients
* address hardlink, checking existing directory
* destination is directory
* check for the key's existence in the map first before accessing its members
* address comments
* deep copy remote entry
* address comments
* copying chunks in parallel
* handle manifest chunks
* address comments
* errgroup
* there could be large chunks
* address comments
* address comments
af3300e063