Re: Line breaks and brackets in LaTeX export

[Max Nikulin]

> > > For a while I have the following question. Is \\{} have the same
> > > effect on tabularray parser as \\\empty?
> >
> > Throw an error before \hline.

It is possible to use
     \begin{tblr}[expand=\empty]{rl}
but I would prefer to reserve such feature for a more nobble purpose.

> I've had a
> first look at tabularray.sty, but I'm not familiar enough with the new
> LaTeX 3 syntax and, frankly, I'm lost...

While it is not easy for me to read code LaTeX2e core and packages, I 
should say that I have no guess at all when I am looking at tabularray 
sources. It is a completely different language.

I have started a discussion requesting for a \\-like command without 
optional arguments. Maybe somebody will suggest a better workaround instead.
https://github.com/lvjr/tabularray/discussions/321

> I've tried all the packages involved in tables that I can think of
> (longtable, siunitx, tabularx, booktabs, array, and I don't know if I
> forgot any) and in all of them the \empty solution works fine. It seems
> that tabularray is the black sheep here.

I think tabularray is unique with a regexp-based parser. I had a hope 
that new approach does not allow newline between \\ and its arguments, 
but unfortunately compatibility with older code is preserved in this aspect.

From LaTeX companion I remember supertabular as an alternative for 
longtable, but I am unsure if it is alive yet.