[R6RS] Hashing questions

[Michael Sperber]

A few questions:

I see the proposal has `equal-hash'.  Is there a special reason why
`eq-hash' and `eqv-hash' aren't provided?  Also, the Haskell folks use
a more primitive abstraction (called stable names) on top of which they
implement their equivalent of eq? hash tables.

http://citeseer.ist.psu.edu/peytonjones99stretching.html

(I'm sure there are earlier sources.  It's just what I could find most
easily.)

Would these make sense generally as a base abstraction to build eq? 
hash tables or for R6RS?  I think someone mentioned that there were
efficiency concerns---if so could somebody hint at them briefly?

-- 
Cheers =8-} Mike
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