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(guile.info)Weak key hashes

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Weak key hashes
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 - primitive: make-weak-key-hash-table k
 - primitive: make-weak-value-hash-table size
 - primitive: make-doubly-weak-hash-table size
     Return a weak hash table with SIZE buckets. As with any hash
     table, choosing a good size for the table requires some caution.

     You can modify weak hash tables in exactly the same way you would
     modify regular hash tables. (Note: Hash Tables)

 - primitive: weak-key-hash-table? x
 - primitive: weak-value-hash-table? obj
 - primitive: doubly-weak-hash-table? obj
     Return #T if OBJ is the specified weak hash table. Note that a
     doubly weak hash table is neither a weak key nor a weak value hash
     table.

 - primitive: make-weak-value-hash-table k

 - primitive: weak-value-hash-table? x

 - primitive: make-doubly-weak-hash-table k

 - primitive: doubly-weak-hash-table? x