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> From: Tom Lord <lord@xxxxxxx> > 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