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为什么在 DeclareNameWrapperFormat 中使用 IfEndWith 会引发错误？

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为什么在 DeclareNameWrapperFormat 中使用 IfEndWith 会引发错误？

我想用这解决方案在 BibLaTeX 中具有所有格引用，但将其扩展以正确解释以 's' 结尾的名称（至少在英文中）。该问题中发布的解决方案才不是考虑到这些，但是做在我的计算机上编译成功。

我认为我可以通过仅使用xstring来检查名称是否以“s”结尾，从而轻松地扩展它，如果以“s”结尾，则仅添加'到末尾，而不是's。我尝试了下面的 mwe，但出现编译错误：

错误

ERROR: Illegal parameter number in definition of \xs_arg_i.

--- TeX said ---
<to be read again> 
=
l.51 \posscite{crane22_plural} 
                             is the easy case.

平均能量损失

\documentclass{article}
\author{ModallyFragile}
\title{Foo}

\usepackage{xstring}
\usepackage{filecontents}
\usepackage[style=authoryear]{biblatex}
\addbibresource{\jobname.bib}

% Support possessive citation
\DeclareNameWrapperFormat{labelname:poss}{\IfEndWith{#1}{s}{#1'}{#1's}}
\DeclareFieldFormat{shorthand:poss}{\ifnameundef{labelname}{\IfEndWith{#1}{s}{#1'}{#1's}}{#1}}
\DeclareFieldFormat{citetitle:poss}{\mkbibemph{\IfEndWith{#1}{s}{#1'}{#1's}}}
\DeclareFieldFormat{label:poss}{\IfEndWith{#1}{s}{#1'}{#1's}}

\newrobustcmd*{\posscitealias}{%
  \AtNextCite{%
    \DeclareNameWrapperAlias{labelname}{labelname:poss}%
    \DeclareFieldAlias{shorthand}{shorthand:poss}%
    \DeclareFieldAlias{citetitle}{citetitle:poss}%
    \DeclareFieldAlias{label}{label:poss}}}

\newrobustcmd*{\posscite}{%
  \posscitealias%
  \textcite}

\newrobustcmd*{\Posscite}{\bibsentence\posscite}

\newrobustcmd*{\posscites}{%
  \posscitealias%
  \textcites}

\begin{filecontents}{\jobname.bib}
@Article{crane22_plural,
    date = {2022},
    title = {Plurals are easy!},
    author = {Crane, Tim},
    timestamp = {2023-07-23 20:44:43 (BST)}
}

@Article{mills23_plural,
    date = {2023},
    title = {Plurals are hard},
    author = {Mills, Charles W.},
    timestamp = {2023-07-23 20:44:18 (BST)}
}
\end{filecontents}

\begin{document}

\posscite{crane22_plural} is the easy case.

But \posscite{mills23_plural} is the hard case.

\end{document}

我已将错误归咎于我对IfEndWith内部的使用DeclareNameWrapperFormat。

是什么原因造成的（以及我该如何阻止它发生）？

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