Sets the values of the leafs to the new set of values and updates the tag tree accordingly. No leaf can change its value if either the new or old value is smaller than largest threshold which has yet been supplied to 'encode()'. However such a leaf can keep its old value (i.e. new and old value must be identical.

       <p>This method is more efficient than the setValue() method if a large
       proportion of the leafs change their value. Note that for leafs which
       don't have their value defined yet the value should be
       Integer.MAX_VALUE (which is the default initialization value).</p>