docs: private boolean isDuplicateName(String name) {
  		if (this.existingNames != null) {
  			final String newName = Strings.nullToEmpty(name);
  			for (final String existingName : this.existingNames) {
  				if (newName.equals(existingName)) {
  					return true;
  				}
  			}
  		}
  		return false;
  	}