code: public void setNumberOfNativeSpeakers(String numberOfNativeSpeakers) {
      if(numberOfNativeSpeakers != null) {
        numberOfNativeSpeakers = numberOfNativeSpeakers.trim();
      }
      this.numberOfNativeSpeakers = numberOfNativeSpeakers;
  
      setMinimumNumberOfNativeSpeakers(NumberUtil.minimumFromRange(numberOfNativeSpeakers));
      setMaximumNumberOfNativeSpeakers(NumberUtil.maximumFromRange(numberOfNativeSpeakers));
    }
docs: Set number of persons who natively speak the detected language.
  <p>
  Based on the wikipedia page there will be no fewer than 1 million speakers.
  Based on results from calling the alchemy api this will be a string in the
  format:
  <p>
  6.45 million
  <p>
  105 million
  <p>
  309-400 million
  
  @param numberOfNativeSpeakers number of persons who natively speak the detected language
  
  @see <a href="https://en.wikipedia.org/wiki/List_of_languages_by_number_of_native_speakers">https://en.wikipedia.org/wiki/List_of_languages_by_number_of_native_speakers</a>