docs: byte[][] getFamilyKeys() {
  		Charset c = Charset.forName(charset);
  
  		byte[][] familyKeys = new byte[this.familyMap.size()][];
  		int i = 0;
  		for (String name : this.familyMap.keySet()) {
  			familyKeys[i++] = name.getBytes(c);
  		}
  		return familyKeys;
  	}