I don't know if someone has already cited this lengthy interview to Hal Abelson (co-author of SICP) about this change, but I think it is worthy to point it out:

I don't know if someone has already cited this lengthy interview to Hal Abelson (co-author of SICP) about this change, but I think it is worthy to point it out: http://www.codequarterly.com/2011/hal-abelson/ http://www.codequarterly.com/2011/hal-abelson/