code: private void write(MultiPoint points, JsonGenerator gen) throws IOException {
          gen.writeStringField("type", "MultiPoint");
          gen.writeFieldName("coordinates");
          writeCoordinates(points.getCoordinates(), gen);
      }
docs: Coordinates of a MultiPoint are an array of positions:
  
  { "type": "MultiPoint", "coordinates": [ [100.0, 0.0], [101.0, 1.0] ] }
  
  
  @param points
  @param gen
  @throws IOException