hashtable or hash-table
Oddly iterate spells it "in-hashtable", while Common Lisp itself (as well as Alexandria and Serapeum) spell things involving hash tables as 'hash-table' with a hyphen. I'm guessing I'm not the only one this divergence in spelling trips up frequently. It would seem sensible to add "in-hash-table" to iterate, and I think doing so would break no existing code so long as "in-hashtable" also remains as an alternative.
Having briefly discussed this with Robert Goldman by mail, I will set about figuring out how to make this happen, and submit a merge request once it seems to be working, including updating the unit tests and documentation.