Unary Minus looks too wide, math superscript too high

I don't know whether this is the right place to report this.
When manually typesetting the exponents in Makie (to circumvent https://github.com/JuliaPlots/Makie.jl/issues/1296),
the spacing between the minus sign and the number inside the exponent looks too wide. It looks more like the spacing for a binary minus, see the tex code for comparison.

Furthermore, the baseline of the exponent looks too high compared to tex.

```tex
\documentclass{standalone}

\begin{document}

\begin{tabular}{rlr}
unary: & $10^{-16}$,& $-16$ \\
binary: & $10^{{}-16}$,& ${}-16$
\end{tabular}

\end{document}
```


```julia
using CairoMakie
using CairoMakie.Makie: LaTeXString

fig = Figure(font="cmu")
ax = Axis(
fig[1,1];
ytickformat = ts -> [LaTeXString("\$ $(round(t/1e-16, digits=3)) \\times 10^{-16} \$") for t in ts],
)
lines!(ax, 1:10, rand(10) .* 1e-16)

save("fig.pdf", fig)
```


Edit: I have no idea why the images are not rendered.