%&latex
\errorcontextlines=1000
\documentclass[a4paper]{article}

\usepackage[cmoldstylemathdigits]{cmolddig}

\makeatletter
\renewcommand\section{\@startsection {section}{1}{\z@}%
                                   {-3.25ex\@plus -1ex \@minus -.2ex}%
                                   {1.5ex \@plus .2ex}%
                                   {\normalfont\bfseries}}
\makeatother

\newcommand{\testtext}{Some text numerals: 0123456789.  Some maths 
numerals $0123456789$}

\begin{document}

\section{Default}
\testtext

\section{Both lining}
{\cmliningdigits\cmliningmathdigits
\testtext}

\section{Text lining; maths default}
{\cmliningdigits
\testtext}

\section{Text lining; maths oldstyle}
{\cmliningdigits\cmoldstylemathdigits
\testtext}

\section{Text oldstyle; maths default}
{\cmoldstyledigits
\testtext}

\section{Text oldstyle; maths oldstyle}
{\cmoldstyledigits\cmoldstylemathdigits
\testtext}

\section{Text oldstyle; maths lining}
{\cmoldstyledigits\cmliningmathdigits
\testtext}

\end{document}