code: public DataSetBuilder sequence(String column, int initial, int step) {
      return sequence(column, (Integer) initial, n -> n + step);
    }
docs: Set <code>int</code> sequence filler for column
  with a specified step.
  
  <p>
  A call to this method is shorthand for
  <code>sequence(column, initial, n -&gt; n + step)</code>.
  </p>
  
  @param column Column name.
  @param initial Initial sequence value.
  @param step Sequence step.
  @return The builder instance (for chained calls).
  @see #sequence(String, Object, UnaryOperator)
  @see #sequence(String, int)