Hash-table literals are covered by (among others):

  - Serapeum
  - golden-utils
  - rutils
  - make-hash

Though now I'm wondering which libraries would make for a proper canonical extended core... asdf, uiop (comes with asdf, so naturally), alexandria, bordeaux-threads, cffi, cl-ppcre, str, local-time, trivia,... and maybe fset? (although I personally prefer Sycamore's naming conventions)

...maybe also fivem (although I personally prefer parachute) and hunchentoot.