public boolean visitsAllBuckets() {
            return true;
        }
Ensure that a given <code>ProgressToken</code> instance only has
buckets pending that have a used-bits count of that of the
<code>targetDistCits</code>. This is done by splitting or merging
all inconsistent buckets until the desired state is reached.

Time complexity is approx <i>O(4bn)</i> where <i>b</i> is the maximum
delta of bits to change anywhere in the set of pending and <i>n</i>
is the number of pending. This includes the time spent making shallow
map copies.

@param targetDistBits The desired distribution bit count of the buckets
documentapi/src/main/java/com/yahoo/documentapi/VisitorIterator.java