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\documentclass[border=2mm]{standalone}
\usepackage{luamplib}
\begin{document}
\begin{mplibcode}
beginfig(1);

    u = 8mm;
    defaultfont := "texnansi-lmr10";
    string minus_sign;
    minus_sign := char 12;  % if you are using the 8r encoding
    minus_sign := char 143; % if you are using the texnansi encoding
    for x=-3 upto 3: label(decimal x, (x*u,+9)) withcolor .67 red; endfor
    for x=-3 upto 3: label(if x<0: minus_sign & fi decimal abs(x), (x*u,-5)) withcolor .58 blue; endfor
    label.lft("with plain decimal:" infont "texnansi-lmss10" scaled 0.9, (-3.6u,9)) withcolor .67 red;
    label.lft("with this hack:" infont "texnansi-lmss10" scaled 0.9, (-3.6u,-5)) withcolor .58 blue;

endfig;
\end{mplibcode}
\end{document}