This site is a static rendering of the Trac instance that was used by R7RS-WG1 for its work on R7RS-small (PDF), which was ratified in 2013. For more information, see Home.
These R6RS procedures were part of #77 (modularization of multiple values), but were never explicitly voted up or down by WG1, so I'm opening a new ticket for them.
We voted to add these to the core.