This page is part of the web mail archives of SRFI 43 from before July 7th, 2015. The new archives for SRFI 43 contain all messages, not just those from before July 7th, 2015.
What about: procedure: %-copy collection => % Returns a copy of the collection. This can be done trivially with an iterator, but an implementation may choose to allow this function to behave more efficiently on certain collections. Regards Michael Burschik