You didn't say what you wanted this object to do...

If you want it to store the range list, and then be used as a sort of iterator, then you might want to split the work in two:

• during the initialisation of the object, validate the ranges, remove all duplicates and overlaps and store the resulting list of ranges in ascending order.

• implement a "next" method for use:

    while (my $num = $range->next) { }
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• housekeeping to reset the iterator, test its state etc.

Of course, it may be that you seldom have large enough ranges to care about the size of a pre-calculated list.