Losing double backslashes, used with mathjax

[sradc]

Hey, thanks for this library!

I've come accross an issue where double backslashes are lost. Losing the \\ is causing newlines to be lost in MathJax rendering.

Minimal example to recreate:

example.md

Example markdown

$$
y_k = [x_0, x_1,... x_{N-1}]
\begin{bmatrix}
    \exp(0)\\
    \exp(-i\frac{2 \pi k}{N})\\
    \exp(-i\frac{2 \pi k}{N}2)\\
    \exp(-i\frac{2 \pi k}{N}3)\\
    \exp(-i\frac{2 \pi k}{N}4)\\
    \vdots \\
    \exp(-i\frac{2 \pi k}{N}(N-1))
\end{bmatrix}
$$

convert.py

import marko
from pathlib import Path

infile = Path("example.md")
out = Path("example.html")
out.write_text(marko.convert(infile.read_text()))

example.html

<p>$$
y_k = [x_0, x_1,... x_{N-1}]
\begin{bmatrix}
\exp(0)\
\exp(-i\frac{2 \pi k}{N})\
\exp(-i\frac{2 \pi k}{N}2)\
\exp(-i\frac{2 \pi k}{N}3)\
\exp(-i\frac{2 \pi k}{N}4)\
\vdots \
\exp(-i\frac{2 \pi k}{N}(N-1))
\end{bmatrix}
$$</p>

^- notice that there's now only single backslashes at the end of the lines.

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Edit: Hmm, cmark does the same thing..

But I think the \\ notation works with GH pages. Not sure what I'm missing.

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Edit: found pandoc preserves the double backslashes.