Bug in Loop and Deliver Best

I have noticed that, if one of the performances delivered to the "Loop and Deliver Best" operator is missing (NAN is delivered) then that operator treats it as the best performance and returns it at the output.  Below is a sample process:

 <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="7.4.000" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="retrieve" compatibility="7.4.000" expanded="true" height="68" name="Retrieve Iris" width="90" x="93" y="74">
        <parameter key="repository_entry" value="//Samples/data/Iris"/>
      </operator>
      <operator activated="true" class="set_data" compatibility="7.4.000" expanded="true" height="82" name="Set Data" width="90" x="241" y="75">
        <parameter key="example_index" value="3"/>
        <parameter key="attribute_name" value="a1"/>
        <parameter key="value" value="NaN"/>
        <list key="additional_values"/>
      </operator>
      <operator activated="true" class="loop_and_deliver_best" compatibility="7.4.000" expanded="true" height="103" name="Loop and Deliver Best" width="90" x="514" y="69">
        <process expanded="true">
          <operator activated="true" class="extract_performance" compatibility="7.4.000" expanded="true" height="82" name="Performance" width="90" x="314" y="34">
            <parameter key="performance_type" value="data_value"/>
            <parameter key="attribute_name" value="a1"/>
            <parameter key="example_index" value="%{a}"/>
          </operator>
          <operator activated="true" class="multiply" compatibility="7.4.000" expanded="true" height="103" name="Multiply" width="90" x="556" y="34"/>
          <connect from_port="in 1" to_op="Performance" to_port="example set"/>
          <connect from_op="Performance" from_port="performance" to_op="Multiply" to_port="input"/>
          <connect from_op="Multiply" from_port="output 1" to_port="performance vector"/>
          <connect from_op="Multiply" from_port="output 2" to_port="out 1"/>
          <portSpacing port="source_in 1" spacing="0"/>
          <portSpacing port="source_in 2" spacing="0"/>
          <portSpacing port="sink_performance vector" spacing="0"/>
          <portSpacing port="sink_out 1" spacing="0"/>
          <portSpacing port="sink_out 2" spacing="0"/>
        </process>
      </operator>
      <connect from_op="Retrieve Iris" from_port="output" to_op="Set Data" to_port="example set input"/>
      <connect from_op="Set Data" from_port="example set output" to_op="Loop and Deliver Best" to_port="in 1"/>
      <connect from_op="Loop and Deliver Best" from_port="performance" to_port="result 1"/>
      <connect from_op="Loop and Deliver Best" from_port="out 1" to_port="result 2"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
      <portSpacing port="sink_result 3" spacing="0"/>
    </process>
  </operator>
</process>

Best

Marcin