code: public static void writeProps(VectorTile.Tile.Layer.Builder layerBuilder,
                                    MvtLayerProps layerProps) {
  
          // Add keys
          layerBuilder.addAllKeys(layerProps.getKeys());
  
          // Add values
          final Iterable<Object> vals = layerProps.getVals();
          for (Object val : vals) {
              layerBuilder.addValues(MvtValue.toValue(val));
          }
      }
docs: Modifies {@code layerBuilder} to contain properties from {@code layerProps}.
  
  @param layerBuilder layer builder to write to
  @param layerProps properties to write