I read:

"The mechanism defined in this SRFI can be used to implement procedure properties, documentation strings, source location information, and other things in Scheme."

Why invent something new and less functional
when there is prior art in the form of procedure properties?

http://www.gnu.org/software/kawa/Procedure-properties.html
https://www.gnu.org/software/guile/manual/html_node/Procedure-Properties.html

I could see a new API if it can be implemented portably - but
apparently that is not the case.
--
	--Per Bothner
xxxxxx@bothner.com   http://per.bothner.com/