Removing Oxford Comma from `cleveref`

Question

When citing multiple theorems, cleveref sometimes uses an Oxford Comma (also known as a Serial Comma, apparently), and sometimes doesn't. I would like for it not to.

Note that there is a very similar question on tex.SE: Can cleveref be made to use the Oxford comma for multiple citations?. I tried using \newcommand{\creflastconjunction}{ and~} (this can be un/commented from the MWE below to see its affect), but it did not work. In fact, if one has it, then one can see there is a double space in the first list.

MWE

\documentclass[]{article}
\usepackage{amsthm}
\usepackage{cleveref}
\newtheorem{thm}{Theorem}
\crefname{thm}{Theorem}{Theorems}
\newtheorem{prop}[thm]{Proposition}
\crefname{prop}{Proposition}{Propositions}
\newtheorem{lem}[thm]{Lemma}
\crefname{lem}{Lemma}{Lemmas}
\newcommand{\creflastconjunction}{ and~}
\begin{document}
\begin{thm}
\label{thm1}
    Thm 1
\end{thm}
\begin{prop}
\label{prop}
    Prop 1
\end{prop}
\begin{thm}
    \label{thm3}
    Thm 3
\end{thm}
\begin{lem}
\label{lem}
    Lem 1
\end{lem}
\begin{thm}
    \label{thm5}
    Thm 5
\end{thm}
\cref{thm1,prop,lem}
\cref{thm1,thm3,thm5}
\end{document}

A fix, of course, is to just write \cref{thm1}, \cref{thm3} and \cref{thm5}, but this is removing beneficial functionality.

Answer 1

You need to define also \creflastgroupconjunction as mentioned at the end of section 8.1.1 of the manual (p. 14).

\documentclass[]{article}
\usepackage{amsthm}
\usepackage{cleveref}
\newtheorem{thm}{Theorem}
\crefname{thm}{Theorem}{Theorems}
\newtheorem{prop}[thm]{Proposition}
\crefname{prop}{Proposition}{Propositions}
\newtheorem{lem}[thm]{Lemma}
\crefname{lem}{Lemma}{Lemmas}
\newcommand{\creflastconjunction}{ and~}
\newcommand{\creflastgroupconjunction}{ and~}
\begin{document}
\begin{thm}
\label{thm1}
    Thm 1
\end{thm}
\begin{prop}
\label{prop}
    Prop 1
\end{prop}
\begin{thm}
    \label{thm3}
    Thm 3
\end{thm}
\begin{lem}
\label{lem}
    Lem 1
\end{lem}
\begin{thm}
    \label{thm5}
    Thm 5
\end{thm}
\cref{thm1,prop,lem}
\cref{thm1,thm3,thm5}
\end{document}