如何更改参考文献中首字母的大小写

Question

如何完全控制引用标题首字母的大小写确实如此，但在我看来，一个命令就可以完成

*emphasized text*\documentclass[11pt]{book}
\usepackage{xparse}
\usepackage{tcolorbox}
\usepackage{hyperref}
\usepackage{cleveref}

\makeatletter
    \def\first@up#1#2\relax{\uppercase{#1}#2}%
    \newcommand{\FirstUpcase}[1]%
        {\expandafter\expandafter\expandafter\first@up#1\relax}%
\makeatother

\makeatletter
    \def\first@low#1#2\relax{\lowercase{#1}#2}%
    \newcommand{\FirstLowcase}[1]%
        {\expandafter\expandafter\expandafter\first@low#1\relax}%
\makeatother

\NewDocumentCommand%
    {\TitleRef}{sm}%
    {%begin definition
        \IfBooleanTF{#1}%
            {%
                \FirstUpcase{\getrefbykeydefault{#2}{name}{-1}}%
             }% 
            {%
                \IfRefUndefinedExpandable{#2}{}% 
                    {% begin label is defined, now get hyperlink
                        \hyperlink{\getrefbykeydefault{#2}{anchor}{-1}}%creates the link
                        {\FirstUpcase{\getrefbykeydefault{#2}{name}{-1}}}%error otherwise
                }% end label is defined, now get hyperlink
            }%
    }%end definition

\NewDocumentCommand%
    {\titleRef}{sm}%
    {%begin definition
          \IfBooleanTF{#1}%
              {%
                \FirstLowcase{\getrefbykeydefault{#2}{name}{-1}}%
              }% 
              {%
                \IfRefUndefinedExpandable{#2}{}%
                    {% begin label is defined, now get hyperlink
                        \hyperlink{\getrefbykeydefault{#2}{anchor}{-1}}%
                        {\FirstLowcase{\getrefbykeydefault{#2}{name}{-1}}}%
                     }% end label is defined, now get hyperlink
            }% end if false
    }%definition

\newcommand{\cfbox}[2]%
{%
    \colorlet{currentcolor}{.}%
    {\color{#1}%
    \fbox{\color{currentcolor}#2}}%
}%

\begin{document}

\chapter{ONE}\label{1}
\section{lower}\label{1-1}
\section{Upper}\label{1-2}

Here are what the two commands I have, courtesy of Christian Hufner, do:

TitleRef on lower: \hspace{5mm}  \TitleRef{1-1}\hspace{5mm} (lower changed to Lower)

TitleRef on Upper: \hspace{5mm}  \TitleRef{1-2}\hspace{5mm} (Not changed)

titleRef on Upper: \hspace{5mm}  \titleRef{1-2}\hspace{5mm} (Upper changed to upper)

titleRef on lower: \hspace{5mm}  \titleRef{1-1}\hspace{5mm} (Not changed)


\hspace{-6mm}Here is what I would like one command, TtitleRef, to do:

TtitleRef on Upper:  \hspace{5mm}  \cfbox{red}{upper}\hspace{5mm} (Upper changed to upper)

TtitleRef on lower:\hspace{5mm}   \cfbox{red}{Lower}\hspace{5mm} (lower changed to Lower)

\end{document}

以下是 PDF 版本：