>>46
According to htmlpreview.github.io/?https://github.com/schemedoc/srfi-metadata/blob/master/table.html, it is only Gauche, Loko and STKlos. Might be outdated?
>>47
It seems very upto date actually. It's odd that the implementations mentioned in the SRFI itself would be exlcuded. In any case thanks for mentioning STKlos.