This page is part of the web mail archives of SRFI 56 from before July 7th, 2015. The new archives for SRFI 56 contain all messages, not just those from before July 7th, 2015.
Thanks for the extensive test case. I fixed the problem in Gauche. Now it passes all the tests. (I commented out read-byte, write-byte, peek-byte and byte-ready? definitions in srfi-56.scm, for they are supported natively). --shiro