docs: function generatePolygon() {
    var coordNumber = getRandomNumber(3, options.maxCoordCount);
  
    var feature = rawFeature();
    feature.geometry.type = 'Polygon';
    feature.geometry.coordinates = [
      []
    ];
  
    var firstCoordinate = generateLonLat();
  
    feature.geometry.coordinates[0].push(firstCoordinate);
    addCoordinates(feature.geometry.coordinates[0], coordNumber - 2);
    feature.geometry.coordinates[0].push(firstCoordinate);
  
    return feature;
  }