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The current position of the iterator in the array.

=item odometer

I<Starting value: 0.> The number of cells visited thus far.

=item tourlength

I<Default value: number of cells in the array.> The total number of cells
to visit. This is sometimes used to determine the endpoint of the tour.

=item tourstatus

Initially set to B<START>.  The remaining _tourstatus values (found with
the export tag C<:status>) are B<TOURING> and B<STOP>.

=item array

I<default value: undef.>  A reference to an internal array.  Some sub-classes
need an internal array for bookkeeping purposes.  This is where it will go.