code: @Override
      protected void write(JsonGenerator g, JacksonJrsTreeCodec codec) throws IOException
      {
          g.writeStartObject();
          if (!_values.isEmpty()) {
              for (Map.Entry<String,JrsValue> entry : _values.entrySet()) {
                  g.writeFieldName(entry.getKey());
                  codec.writeTree(g, entry.getValue());
              }
          }
          g.writeEndObject();
      }
docs: /*
  ********************************************************************
  /* Abstract methods
  ********************************************************************