get-hash provides usage specifics of a <hash> (created by new-hash).
Use "length" clause to obtain its <length> (i.e. the number of elements stored in it), "hash-size" clause to obtain its <hash size> (i.e. the number of "buckets", or possible hash codes in the underlying hash table).
"average-reads" clause will obtain in <reads> the average number of reads (i.e. how many string comparisons are needed on average to find a key) multiplied by 100 (so if an average number of reads was 1.5, it will be 150).
This information may be useful in determining the performance of a hash, and whether resize-hash is indicated.
