In practice, Scheme isn't interoperable - you pick a Scheme implementation and pretty much stick with it. Different schemes implement different subsets of SFRI

In practice, Scheme isn't interoperable - you pick a Scheme implementation and pretty much stick with it. Different schemes implement different subsets of SFRIs, and many bring their own non-standard batteries to the table. I think having r7rs large would eventually make the language more interoperable.