[email protected] scripsit:

> So why should a hash value be negative?

Already mentioned:  to improve by a factor of 2 the chance that a hash
code of a given size is a fixnum.

-- 
A rose by any other name                            John Cowan
may smell as sweet,                                 http://www.ccil.org/~cowan
but if you called it an onion                       [email protected]
you'd get cooks very confused.          --RMS

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