"Well... you can only use hashable things as keys in Racket too."
Hm... odd, I remember in Python, that you weren't able to use things like lists (which are mutable) as keys... but I guess I remember wrong because I just tried it and it works. Not sure what the problem was that I had with Python's hash tables...
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By the way, I feel like hash table keys should only use eq, not equal...
"By the way, I feel like hash table keys should only use eq, not equal..."
Racket has eq-based tables too those, and I wouldn't want 'equal? for weak table keys. However, if I want to use a list or something as a key, it's likely because I want to look something up using multiple values, in which case 'equal? is useful. (In those cases, the ability to intern something into an immutable data structure 'equal? to it would probably be just as useful....)
