code: public NumberExpression<T> round() {
          if (round == null) {
              round = Expressions.numberOperation(getType(), MathOps.ROUND, mixin);
          }
          return round;
      }
docs: Create a {@code round(this)} expression
  
  <p>Returns the closest {@code int} to this.</p>
  
  @return round(this)
  @see java.lang.Math#round(double)
  @see java.lang.Math#round(float)