fix: handle preact signals in array correctly

[ph1p]

Changes

This will fix the serialization of preact signals, when they got passed as an array. It also works for objects.

Now it's possible to do something like this:

---
import { signal } from '@preact/signals';

const arrayWithSignals = [
  signal(0),
  signal(30),
  "simple string",
  "a number",
  signal("string signal")
]
---
<ArrayWithSignals count={arrayWithSignals} client:visible>
  <h1>Hello, from array!</h1>
</ArrayWithSignals>

closes #7864

Testing

Tests added.

Docs

Nothing should change for the user.

Before:

before.mp4

After:

after.mp4

[changeset-bot]

🦋 Changeset detected

Latest commit: 9ace408

The changes in this PR will be included in the next version bump.

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