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Marcin 'Qrczak' Kowalczyk <qrczak@xxxxxxxxxx> writes: > Why no current implementation uses sparse arrays as the representation > of (some) vectors? Or does any? Maybe none has gotten around to it? > If no implementation does a particular thing, then perhaps it's not > a wise choice to do. That's a fundamentally bogus argument. If there's a reason it's unwise, then let's hear it. It needs to be a reason why it's *always* unwise, not just why it's unwise in general-purpose Scheme systems. (Though for the life of me I can't think of any reason there either.) No Scheme implementation that I know of supports writing Scheme programs that include identifiers written in the Devanagari script. But that doesn't mean it's an unwise thing to do; it's just that there aren't many Sanskrit users of Scheme yet. > Leaving room for it only reduces programmer confidence and > encourages them to rely on common practice instead of on standard > guarantees. "Reduces programmer confidence"? Huh? Programmer confidence in what? It's you that seems to have mistaken common practice for a standard guarantee. Rewriting the standard so that it standardizes common practice is not the solution. Thomas