Don't lowercase custom element properties #2190
Description
Describe the bug
Custom element props shouldn't be lowercased, as their casing is preserved because it's set as a property, not as an attribute. Since Svelte 4.x that's actually what's happening (was always lowercased before), and we need to adjust the language tools, too.
Reproduction
<a-custom-element camelCase={1} />Expected behaviour
Shouldn't lowercase ce props
System Info
irrelevant
Which package is the issue about?
svelte2tsx
Additional Information, eg. Screenshots
No response