| OK, Simon, it looks as if Fergus and Tom are on board.
Fine. So I'll go with the optional genRange proposal.
In general, the standard libraries have no name conflicts;
you can import them all at will. That's not the only
possible policy (the other is to name similar things the same
and use the module system to disambiguate) but it's the convention
followed by the standard libraries so far, and I don't want to
change that.
So 'genRange' it is, unless someone suggest a better (unused) name.
Simon
