code: @Override
      public String handle(final Object value) {
          if (value instanceof Double) {
              return String.format(Locale.US, "%.14f", (Double) value);
          } else {
              throw new IllegalArgumentException("Can't serialize anything but Double");
          }
      }
docs: {@inheritDoc}
  
  @see fr.dudie.nominatim.client.request.paramhelper.QueryParameterSerializer#handle(java.lang.Object)