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> Interestingly, there's at least one database (AllegroCache) that uses this similarity [...]

It is even more interesting to note that AllegroCache is a Common Lisp product from franz.com

Well, of course it is a Common Lisp product. I haven't seen its internals but I would be surprised if it didn't use the features of CLOS+MOP to that effect, or, vice versa, if these features of CL weren't the very inspiration for that functionality. (Well, maybe Smalltalk could also achieve a similar level of seamlessness.)

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