This page is part of the web mail archives of SRFI 75 from before July 7th, 2015. The new archives for SRFI 75 contain all messages, not just those from before July 7th, 2015.
Almost as an aside, I regard a symbol ending with any of the following four characters as indicating the name of a predicate: = > < ? reading and typing a redundant ? after another character whose presence at the end of a name already indicates a predicate is annoying. Bear