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Allegro CL |
ANSI Common Lisp  18 Hash Tables 18.1 Hash Table Concepts 18.1.2 Modifying Hash Table Keys
18.1.2.4 Visible Modifications by Language ExtensionsImplementations that extend the language by providing additional mutator functions (or additional behavior for existing mutator functions) must document how the use of these extensions interacts with equivalence tests and hash table searches.Implementations that extend the language by defining additional acceptable equivalence tests for hash tables (allowing additional values for the :test argument to make-hash-table) must document the visible components of these tests.
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