Allow matrix delimiter to be smaller than content like latex/plaintex does

[Enter-tainer]

Description

In tex, the delimiter doesn't have to cover all the matrix content. But in typst it always does.

Typst

$ mat(c;c;c;c;delim: "[") mat(f;f;f;f;delim: "[") $

LaTeX

\documentclass{article}
\usepackage{lua-visual-debug}
\title{test}
\begin{document}
$$\pmatrix{c\cr c\cr c\cr c}\pmatrix{f\cr f\cr f\cr f}$$
\end{document}

Reproduction URL

No response

Operating system

Web app, Windows, Linux, macOS

Typst version

• I am using the latest version of Typst

[Enter-tainer]

I suspect this is because typst use a special algorithm to determine the size of the matrix delimiter. AFAIK in texbook, the size of the delimiter is max(inner-size - 5pt, inner-size * 0.901) (\delimiterfactor and \delimitershortfall). And typst use something different: The size is set to 1.1 * inner-size and a 0.1x shortfall.

But i don't really understand it yet. Maybe it's because tex and typst follows somehow different layout model