Minor observation: The order of arguments for hash-table-count and
hash-table-find differs from the analogous count and find procedures of
SRFI 1.

There's probably a good case to be made for leaving the current spec as
is, perhaps to always have the hash-table as the first argument of the
"whole hash table" procedures.  I mention it just in case this design is
not intentional.

Regards,

-chaw