if (_buffer.length < _length + 1) ensureCapacity(_length + 1);
if (_buffer.length < _length + length) ensureCapacity(_length + length);
  public final BinaryBuilderValue append(int v)  {    if (_buffer.length < _length + 1)      ensureCapacity(_length + 1);    _buffer[_length++] = (byte) v;    return this;  }