code: public static final void removeReader(String format) {
  		String key = format.toLowerCase();
  		if (key.equals(JSON)) {
  			throw new IllegalArgumentException("Unable to delete the default JSON reader!");
  		}
  		readers.remove(key);
  	}
docs: Deregisters the given format from the registry.
  
  @param format
  name of the format (eg. "custom", "csv", etc.)