docs: public void setValidCharRange(int minValidChar, int maxValidChar) {
  		if (minValidChar <= maxValidChar) {
  			this.minValidChar = minValidChar;
  			this.maxValidChar = maxValidChar;
  		} else {
  			this.maxValidChar = minValidChar;
  			this.minValidChar = maxValidChar;
  		}
  	}