It seems cache isn't working for getContentModel

[nagashimam]

• Markuplint version: 3.10.0
• Parser lang: HTML
• Node.js version: v18.15.0
• OS: macOS

Describe the bug

In packages/@markuplint/ml-spec/src/dom-traverse/get-content-model.ts, the result is set to cacheByEl in line 35, but the cache is fetched from cachesBySpecs in line 15.

It seems the original intention was to set the result to cachesBySpecs, not cacheByEl.

Code Example

...
const cachesBySpecs = new Map<Specs, Map<Element, ReadonlyDeep<PermittedContentPattern[]> | boolean | null>>();
...
const cacheByEl = cachesBySpecs.get(specs) ?? new Map<Element, PermittedContentPattern[] | boolean>();
...
cacheByEl.set(el, spec.contentModel.contents);
...

Steps To Reproduce

Just run Markuplint as usual.

The current behavior

ContentModel is calculated every time.

The expected behavior

ContentModel is cached after the first calculation.

[nagashimam]

I don't know how to test caching in Jest, but I can create a pull request for this issue if I don't have to add an additional test.