`section-bibliographies.level` and `section-bibliographies.minlevel` not working as expected

[tomicapretto]

I have the following .qmd file:

---
title: Bibliography
filters:
    - section-bibliographies
citeproc: false
bibliography: ../citas/references.bib
section-bibliographies:
    level: 2
    minlevel: 2
---

## Main

<div style="visibility: hidden; height: 0;">
@CasellaBerger2024
@Hastie2009
@Gelman2013
</div>

## Optional

<div style="visibility: hidden; height: 0;">
@Jaynes2003
@Rudin1976
</div>

The current version of the extension doesn't work as intended, I get no bibliography.
If I use level 1 headers then it works, but I want level 2 headers.

After inspecting the Lua code and adding some logging, I figured out the filter was reaching the metadata successfully, but the conversion to numbers in lines 206 and 209 were not working as expected:

section-bibliographies/_extensions/section-bibliographies/section-bibliographies.lua

Lines 206 to 210 in ec4e06b

	opts.level = tonumber(opts.level)
	or tonumber(meta['section-bibs-level'])
	or 1
	opts.minlevel = tonumber(opts.minlevel)
	or 1

As a result, opts.level and opts.minlevel were always set to 1.

To fix it locally, I applied the following change:

@@ -203,10 +203,10 @@ local function get_options (meta)
   opts.bibliography = opts.bibliography
     or meta['section-bibs-bibliography']
     or meta['bibliography']
-  opts.level = tonumber(opts.level)
+  opts.level = tonumber(utils.stringify(opts.level))
     or tonumber(meta['section-bibs-level'])
     or 1
-  opts.minlevel = tonumber(opts.minlevel)
+  opts.minlevel = tonumber(utils.stringify(opts.minlevel))
     or 1
   opts.references = opts.references
     or meta['references']

Do you think this is a satisfactory fix, if this was effectively a bug? Happy to submit a PR, although I'm not very familiar with the testing suite.