and the paper even starts with a critique of the efficiency of Lisp's approach for representing data with cons pairs (citing McCarthy's paper from the same year).
You might also want to watch Casey's great talk on the history of OOP
Get on Zulip[1] and ask for help when stuck. The community is friendly and has gotten quite large although they are mostly mathematicians at the moment.
Yes for the fragment of total and noncomputable functions which mathematicians use. For partial functions (which Lean also supports) I think the same arguments hold as for the "Haskell Category".
https://dl.acm.org/doi/pdf/10.1145/366199.366256
and the paper even starts with a critique of the efficiency of Lisp's approach for representing data with cons pairs (citing McCarthy's paper from the same year).
You might also want to watch Casey's great talk on the history of OOP
https://www.youtube.com/watch?v=wo84LFzx5nI