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Mutating keys

This page is part of the web mail archives of SRFI 69 from before July 7th, 2015. The new archives for SRFI 69 contain all messages, not just those from before July 7th, 2015.

MzScheme contains the following caveat on mutating keys:

   If a key into an equal?-based hash table is mutated (e.g., a key string is
   modified with string-set!), then the hash table's behavior for put and get
   operations becomes unpredictable.

What is the behavior of this SRFI in such a case?