Mensagem de erro estranha "CLOSED INPUT BUFFERED FILE-STREAM CHARACTER" durante a indexação

Question

Estou usando a solução deIndexação com unidades binárias usando o pacote siunitx. Isso não apenas resolveu o problema específico que eu havia postado, mas também pareceu resolver vários outros problemas. No entanto, parece que há alguma dificuldade se houver aspas duplas no unexpandedparâmetro que resulta em

Reading raw-index "/var/folders/70/.../T/N728p7zZMX"...
ERROR: READ: input stream #<CLOSED INPUT BUFFERED FILE-STREAM CHARACTER #P"/var/folders/70/.../T/N728p7zZMX" @3> ends within a string

onde ...estão alguns caminhos gerados aleatoriamente.

O MWE possui apenas uma linha adicionada à solução da questão referenciada

Código:

\documentclass{article}
\usepackage{imakeidx}
\usepackage{xparse}
\usepackage{siunitx}
\usepackage{xcolor}

%% https://tex.stackexchange.com/questions/50712/automatically-convert-quotations-in-the-form-of-abc-to-become-abc
\usepackage{csquotes}
\MakeOuterQuote{"}


\usepackage{hyperref}

\newcommand*\lettergroup[1]{\subsection{#1}}

\newcommand*{\IndexWithName}[2]{%
    % #1 = word to index
    % #2 = index name
    \index[#2]{#1}%
}

\NewDocumentCommand{\FormatIndexEntry}{mm}{%
    \textcolor{blue}{#1} #2%
}


%% Defer the binary units until AFTER \begin{document} as per
%% https://tex.stackexchange.com/questions/287579/how-to-overwrite-siunitxs-binary-prefixes
\sisetup{binary-units=true}
\AtBeginDocument{%
    \DeclareSIUnit\bit{\textcolor{red}{bit}}%
}

\NewDocumentCommand{\AddIndexEntry}{%
    O{}% #1 = index name
      m% #2 = word to index this under
      m% #3 = indexed term
      m% #4 = symbol
}{%
    \expandafter\IndexWithName\expandafter{%
        #2!#3@\FormatIndexEntry{#3}{\unexpanded{\unexpanded{#4}}}%
    }{#1}%
}
\newcommand{\indexopt}[2]{\index[#2]{#1}}

\makeindex[title={Main Index},columns=1,program=texindy]
\makeindex[title={Name Index},columns=1,program=texindy,name=Name]
\indexsetup{level=\section}

\begin{document}

\SI{1}{\bit}

\AddIndexEntry[Name]{Bytes}{Bit}{symbol: \si{\bit}}
\AddIndexEntry[Name]{Bytes}{Bit}{text using "quotes"}% <---- This is a problem.

\clearpage 
\setcounter{secnumdepth}{0}
\printindex[Name]
\end{document}

Answer 1

O caractere "é especial em arquivos de índice e deve ser citado como

""

Por outro lado, "nunca deve ser usado sozinho em um documento LaTeX, mas está tudo bem com csquotes:

\documentclass{article}
\usepackage{imakeidx}
\usepackage{xparse}
\usepackage{siunitx}
\usepackage{xcolor}
\usepackage{csquotes}
\usepackage{hyperref}

\MakeOuterQuote{"}

\newcommand*\lettergroup[1]{\subsection{#1}}

\newcommand*{\IndexWithName}[2]{%
    % #1 = word to index
    % #2 = index name
    \index[#2]{#1}%
}

\NewDocumentCommand{\FormatIndexEntry}{mm}{%
    \textcolor{blue}{#1} #2%
}


%% Defer the binary units until AFTER \begin{document} as per
%% http://tex.stackexchange.com/questions/287579/how-to-overwrite-siunitxs-binary-prefixes
\sisetup{binary-units=true}
\AtBeginDocument{%
    \DeclareSIUnit\bit{\textcolor{red}{bit}}%
}

\NewDocumentCommand{\AddIndexEntry}{%
    O{}% #1 = index name
      m% #2 = word to index this under
      m% #3 = indexed term
      m% #4 = symbol
}{%
    \expandafter\IndexWithName\expandafter{%
        #2!#3@\FormatIndexEntry{#3}{\unexpanded{\unexpanded{#4}}}%
    }{#1}%
}
\newcommand{\indexopt}[2]{\index[#2]{#1}}

\makeindex[title={Main Index},columns=1,program=texindy]
\makeindex[title={Name Index},columns=1,program=texindy,name=Name]
\indexsetup{level=\section}

\begin{document}

\SI{1}{\bit}

\AddIndexEntry[Name]{Bytes}{Bit}{symbol: \si{\bit}}
\AddIndexEntry[Name]{Bytes}{Bitq}{text using ""quotes""}% <---- This is a problem.

\clearpage 
\setcounter{secnumdepth}{0}
\printindex[Name]
\end{document}