Inconsistent numbering of items between enumitem and enumerate environments

Question

I have used the template presented in this answer to create the following document.

\documentclass{amsart}
\usepackage{enumitem}
\usepackage[nameinlink]{cleveref}
\newtheorem{proposition}{Proposition}[section]
\crefname{proposition}{Prop.}{props.}
\newlist{enumprp}{enumerate}{1}
\setlist[enumprp]{label=\upshape(\alph*),ref=\upshape\theproposition(\alph*)}
\crefalias{enumprpi}{proposition}
\makeatletter
\newcounter{subcreftmpcnt}
\newcommand\alphsubformat[1]{(\alph{#1})}
\newcommand\subcref[2][\alphsubformat]{
\ifcsname r@#2@cref\endcsname
  \cref@getcounter {#2}{\mylabel}
  \setcounter{subcreftmpcnt}{\mylabel}
  \alphsubformat{subcreftmpcnt}
 \else ?? \fi}
\makeatother
\begin{document}
\begin{proposition}
\begin{enumprp}
\item One
\item Two
\end{enumprp}
\end{proposition}
\begin{proof}
\begin{enumerate}
\item One
\item Two
\end{enumerate}
\end{proof}
\end{document}

The result is

Observe that the numbering of the items in the proposition statement is (a), (b), whereas the numbering of the items in the proof is (1), (2).

How can I make the numbering in the statement (1), (2)? (Actually, I'd rather the numbering be 1., 2.)

Answer 1

Use

\setlist[enumprp]{label=\upshape(\arabic*),ref=\upshape\theproposition(\arabic*)}

i.e. \arabic, not \alph.