docs: ConverterSet add(Converter converter, Converter[] removed) {
          Converter[] converters = iConverters;
          int length = converters.length;
  
          for (int i=0; i<length; i++) {
              Converter existing = converters[i];
              if (converter.equals(existing)) {
                  // Already in the set.
                  if (removed != null) {
                      removed[0] = null;
                  }
                  return this;
              }
              
              if (converter.getSupportedType() == existing.getSupportedType()) {
                  // Replace the converter.
                  Converter[] copy = new Converter[length];
                      
                  for (int j=0; j<length; j++) {
                      if (j != i) {
                          copy[j] = converters[j];
                      } else {
                          copy[j] = converter;
                      }
                  }
  
                  if (removed != null) {
                      removed[0] = existing;
                  }
                  return new ConverterSet(copy);
              }
          }
  
          // Not found, so add it.
          Converter[] copy = new Converter[length + 1];
          System.arraycopy(converters, 0, copy, 0, length);
          copy[length] = converter;
          
          if (removed != null) {
              removed[0] = null;
          }
          return new ConverterSet(copy);
      }