Method on MemberKeyDictionary to copy members between keys
It would be nice if there was a method similar to Collection.copy which took additional parameters of a start and an end key, and copied all entries in the source collection between those keys to the destination collection.
Currently the only way to do this is with a loop or iterator, which is a verbose way of doing a simple thing, and I would expect a native method to perform better, as Collection.copy is faster than a loop.
I submitted this as an NFS in 2004 (#35309).
John Munro
