Visible Modification of Hash Tables with respect to EQUALP (ANSI and GNU Common Lisp Document)

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#### 18.1.2.8 Visible Modification of Hash Tables with respect to EQUALP

In a hash table, any visible change to the count of entries in the hash table, to the keys, or to the values associated with the keys is considered a visible modification with regard to equalp.

Note that the visibility of modifications to the keys depends on the equivalence test of the hash table, not on the specification of equalp.