> From: Tom Lord <xxxxxx@emf.net>

    > They are at least awefully close.  I wouldn't leap to the conclusion
    > that either is cheaper than the other.

Oh, and also: obviously it depends on the underlying Scheme
implementation.   For example, while the return of values through a
pointer _may_ add a small cost in SCM-style implementations, the
passing of parameters as pointers may very well _save_ costs with many
other kinds of collector.

-t