Spread operator doesn't work in SVG elements

[kpjava]

Describe the bug
When trying to fill in various attributes of an SVG element using the spread operator I get a read-only error. This seems like it might be related to the closed issue of #1664. If I explicitly set the attributes from an object, the SVG element renders just fine.

Failing script: https://svelte.dev/repl/a9c3d921ed4e4ab7923d64d30ed3a497?version=3.9.2

A similar script that works: https://svelte.dev/repl/62e182c229f24c2ea5bd77d307de266f?version=3.9.2

Logs
When I try the failing script above, I get this error: Cannot assign to read only property 'x' of object '#<SVGRectElement>'

Severity
I am trying to use Svelte to work with dynamic SVG elements, so this is a major blocker.

[Conduitry]

Also potentially related to #2732.