Yeah, the Lisp world figured out cdr-coding in the 1970s and had moved on to chains of vectors by 1985 according to https://cpsc.yale.edu/sites/default/files/fi

Yeah, the Lisp world figured out cdr-coding in the 1970s and had moved on to chains of vectors by 1985 according to https://cpsc.yale.edu/sites/default/files/files/tr362.pdf https://cpsc.yale.edu/sites/default/files/files/tr362.pdf. Fortunately they avoided changing the API to make this tradeoff.