return Mid(aResult, 0, aLengthToCopy);
aResult = Substring(*this, 0, aLengthToCopy); return aResult.Length();
basic_nsAReadableString<CharT>::Left( basic_nsAWritableString<CharT>& aResult, PRUint32 aLengthToCopy ) const  {    return Mid(aResult, 0, aLengthToCopy);  }