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> It's easy to replace the "...?" suffix with an "is..." prefix, but the "!"
> is handy because it's hard to come up with letters that have the same
> "feel".

Perhaps "dosort(x)" versus "y = sort(x)"?

Also, one thing about using "!" and "?" in identifiers is that I find it
hard to imagine using them anywhere but at the end (eg, "xyz?pqr" seems

Peter Hill.