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There's plenty wrong with hashtables in Common Lisp, they feel like an ugly bolt on. There's no convenient way to construct them or look at them (they're not readably printable, and you can't fix that yourself either). Even checking key presence in a hashtable requires multiple-value contortions.

On a more fundamental level, they also suffer more than sequences from the fact that common lisp has no well thought out concept of equality.






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