Option "label" adds an extra pair of braces to \cs{the\@enumctr}

[muzimuzhi]

When option label is used, an extra pair of braces is added to \cs{the\@enumctr}, which influences \@currentlabel. This may break macros aiming to retrieve value from a label, for example the \gerrefnumber from refcount package (see this TeX-SX question as an example).

Is this pair of braces a must?

\documentclass{article}
\usepackage{enumitem}

\begin{document}
\makeatletter
\def\test{\meaning\@currentlabel}
\makeatother

\begin{enumerate}
  \item text \test
  % this defines \@currentlabel to "1"
\end{enumerate}

\begin{enumerate}[label=\arabic*., ref=\arabic*]
  \item text \test
  % this defines \@currentlabel to "{1}"
\end{enumerate}
\end{document}

Related source code, see line 548:

enumitem/enumitem.sty

Lines 541 to 551 in 1bdcad0

	\def\enit@reflabel#1#2{%
	\ifnum\enit@depth=\@ne\else % no level 0
	\advance\enit@depth\@ne
	\@namedef{p@\@enumctr}{}% Don't accumulate labels
	\advance\enit@depth\m@ne
	\fi
	\ifcase#2%
	\@namedef{the\@enumctr}{{#1}}%
	\else
	\enit@normlabel{\csname the\@enumctr\endcsname}{#1}%
	\fi}