[plt-scheme] eq-hash-code

Very interesting.  If you don't care about the value fitting into a
fixnum, is there any way to generate a hash code that is guaranteed to
be unique?  For example, does Scheme have some sort of internal
"address" of each allocation that stays consistent even when 3m
actually moves around the objects in real memory?  If so, is there a
way to grab that address from a Scheme function call?

Thanks,

Mark