protected CharsetDecoder (Charset cs, float averageCharsPerByte, float maxCharsPerByte)
private CharsetDecoder (Charset cs, float averageCharsPerByte, float maxCharsPerByte, String replacement)
  protected CharsetDecoder (Charset cs, float averageCharsPerByte,                            float maxCharsPerByte)  {    this (cs, averageCharsPerByte, maxCharsPerByte, DEFAULT_REPLACEMENT);  }