Allow customizing equation numbering in Typst output

[mvuorre]

Description

(Discussed previously at #13457)

Description

I would like to customize how equations are numbered in Typst output. The "(1)" numbering is currently hard coded in Quarto.

Current behavior

Here is an example Quarto Typst document:

---
title: "Hello Typst!"
format:
  typst:
    include-before-body:
      - text: |
          #set text(fill: red) // To confirm code is passed
          #set math.equation(numbering: "A.")
    keep-typ: true
---

Math numbering (@eq-test).

$$
y = 1
$$ {#eq-test}

It creates this .typ output (showing only relevant bits at the end):

#set text(fill: red) // To confirm code is passed
#set math.equation(numbering: "A.")

Math numbering (#ref(<eq-test>, supplement: [Equation])).

#math.equation(block: true, numbering: "(1)", [ $ y = 1 $ ])<eq-test>

And this PDF document:

Desired behavior

I tested this syntax in the Typst webapp and it produces desired output:

#set math.equation(numbering: "A.")

#math.equation(block: true, [ $ y = 1 $ ])<eq-test>

Notes

Among other things, this would be useful in appendices when I'd like to re-number equations as e.g. "A.1." and so forth.

[cscheid]

This came from fixing #7744 in https://github.com/quarto-dev/quarto-cli/commits/c99c071cfd. We definitely need to improve that, and I think it's actually a bug.

[mcanouil]

Now tracked in:

• Typst equation numbering is hardcoded #13462