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| ANSI Common Lisp 18 Hash Tables 18.2 Dictionary of Hash Tables
18.2.5 hash-table-rehash-size | Function
  Syntax: hash-table-rehash-size hash-table rehash-size Arguments and Values: hash-table - a hash table. rehash-size - a real of type `(or (integer 1 *) (float (1.0) *))`. Description: Returns the current rehash size of hash-table, suitable for use in a call to make-hash-table in order to produce a hash table with state corresponding to the current state of the hash-table. Examples:
       (setq table (make-hash-table :size 100 :rehash-size 1.4))
       #<HASH-TABLE EQL 0/100 2556371>
       (hash-table-rehash-size table)  1.4
Exceptional Situations: Should signal an error of type type-error if hash-table is not a hash table. See Also: make-hash-table, hash-table-rehash-threshold Notes: If the hash table was created with an integer rehash size, the result is an integer, indicating that the rate of growth of the hash-table when rehashed is intended to be additive; otherwise, the result is a float, indicating that the rate of growth of the hash-table when rehashed is intended to be multiplicative. However, this value is only advice to the implementation; the actual amount by which the hash-table will grow upon rehash is implementation-dependent. Allegro CL Implementation Details: None.

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