code: @Override
      public String handle(final Object value) {
          if (value instanceof NominatimRequest) {
              return ((NominatimRequest) value).getQueryString();
          } else {
              return value.toString();
          }
      }
docs: {@inheritDoc}
  
  @see fr.dudie.nominatim.client.request.paramhelper.QueryParameterSerializer#handle(java.lang.Object)