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Fair enough, I take your points both about the ease of
making a new generator. Is it possible to make the existing
one a bit less surprising, though, by having it raise an
exception when it wraps? I'm at a loss to think of any
algorithm that would work correctly when it wraps, so a new
exception wouldn't be a change in interface reeeeeeeeally. ;)

Failing that, is it possible to document it?