Biblatex \textcite 同一作者的多个参考文献，带上标参考编号

Question

这个问题与Biblatex-nature \textcite 带上标参考编号，展示如何让 \textcite 使用上标数字。

但当我引用同一作者的多篇参考文献时，它不起作用。

这是一个 MWE（结果类似于作者¹ -3）

\documentclass{report}

\usepackage[citestyle=numeric-comp]{biblatex}
\usepackage{filecontents}

\begin{filecontents}{ABib.bib}
@article {a1,
 AUTHOR = {Author},
 TITLE = {A sample paper},
 JOURNAL = {Sample journal},
 VOLUME = {1},
 YEAR = {2013},
 NUMBER = {1},
 PAGES = {1--2}}
@misc{a2,
 AUTHOR = {Author},
 TITLE = {A sample paper},
 YEAR = {2013}}
@misc{a3,
 AUTHOR = {Author},
 TITLE = {A sample paper},
 YEAR = {2013}}
\end{filecontents}

\addbibresource{ABib.bib}

%%%%%%%%
\makeatletter
\renewbibmacro*{textcite}{%
  \iffieldequals{namehash}{\cbx@lasthash}
    {\usebibmacro{cite:comp}}
    {\usebibmacro{cite:dump}%
     \ifbool{cbx:parens}
       {\bibclosebracket\global\boolfalse{cbx:parens}}
       {}%
     \iffirstcitekey
       {}
       {\textcitedelim}%
     \usebibmacro{cite:init}%
     \ifnameundef{labelname}
       {\printfield[citetitle]{labeltitle}}
       {\printnames{labelname}}%
     \addspace
     \ifnumequal{\value{citecount}}{1}
       {\usebibmacro{prenote}}
       {}%
     \mkbibsuperscript{\usebibmacro{cite:comp}}%
     \stepcounter{textcitecount}%
     \savefield{namehash}{\cbx@lasthash}}}
\makeatother

\begin{document}
\textcite{a1,a2,a3}
\end{document}

ps 原始问题是很久以前提出的，而且我太新了，没有足够的声誉在那里发表评论，所以我在这里提出这个新问题。