All types in lisp that are programmer's integer, string, symbol .. about 20) , as oppoesed to special elisp editing types.

Everything starting with # like #

Check the 3 links on the bottom. Alist is list of cons cells. Every list is also Alist: (list-utils-safe-equal '(1 2 3 4) '(1 . (2 3 4))) ==> true

These people have lisp that fits into 512 bytes ...