How to italicize enumeration in task environment

Question

Consider the following MWE:

\documentclass{article}
\usepackage{tasks}

\begin{document}
\begin{tasks}[label-format=\itshape](4)
    \task Ex. 1
    \task Ex. 2
    \task Ex. 3
    \task Ex. 4
\end{tasks}
\end{document}

I would like to not italicize the parentheses:

Is it possible to achieve it in an easy way?

Thanks!

Answer 1

One should use \textup{)}, so the italic correction would be automatically added; unfortunately, this crashes because of the nature of \textup that doesn't really like to be used in that place. However, there's an easy fix.

Note that \upshape doesn't take an argument.

\documentclass{article}
\usepackage{tasks}
\usepackage{etoolbox}
\robustify{\textup}

\begin{document}

\begin{tasks}[label-format=\itshape,counter-format=tsk[a]\upshape{)}](4)
    \task Ex. 1
    \task Ex. 2
    \task Ex. 3
    \task Ex. 4
\end{tasks}

\begin{tasks}[label-format=\itshape,counter-format=tsk[a]\/\upshape)](4)
    \task Ex. 1
    \task Ex. 2
    \task Ex. 3
    \task Ex. 4
\end{tasks}

\begin{tasks}[label-format=\itshape,counter-format=tsk[a]\textup{)}](4)
    \task Ex. 1
    \task Ex. 2
    \task Ex. 3
    \task Ex. 4
\end{tasks}

\end{document}

You can see that the second and third examples print the same. In the second example, the italic correction \/ is explicitly added.

Answer 2

Thanks to @AlanMunn for the hint.

I added the \upshape command only for the parentheses and used tsk[a] for a, b, c, ... style numbers, all inside counter-format command.

\documentclass{article}
\usepackage{tasks}

\begin{document}
\begin{tasks}[label-format=\itshape,counter-format=tsk[a]\upshape{)}](4)
    \task Ex. 1
    \task Ex. 2
    \task Ex. 3
    \task Ex. 4
\end{tasks}
\end{document}