[BUG]: Unexpected auto-generated SERIAL column values when using IndexedDB filesystem

**Describe the bug**

When using **PGlite with IndexedDB filesystem**, a `SERIAL` primary key increments by **33** on each insert instead of incrementing by **1**.
This does **not** happen when using the default (in-memory) storage.

**To Reproduce**

##### Code Sample

```vue

import { ref } from 'vue'
import { PGlite } from '@electric-sql/pglite'
import { live } from '@electric-sql/pglite/live'

const PGliteDB = await PGlite.create('idb://my-database', {
extensions: {
live,
},
})

// Default (Memory)
// const PGliteDB = await PGlite.create({
// extensions: {
// live,
// },
// })

const todo = ref()

await PGliteDB.exec(`
CREATE TABLE IF NOT EXISTS todo (
id SERIAL PRIMARY KEY,
task TEXT
);

INSERT INTO todo (task) VALUES ('task');
`)

todo.value = await PGliteDB.exec('SELECT * FROM todo;')

{{ todo }}

```

##### Repository

Minimal reproduction repository:
👉 [on branch (vue-pglite)](https://github.com/Us3r-gitHub/Playground/tree/vue-pglite)

---

**Logs / Screenshots**

##### Using IndexedDB

##### Using in-memory

### Comparison

| Storage type | Behavior |
| -------------------- | ------------------ |
| In-memory (default) | ✅ Increments by 1 |
| IndexedDB (`idb://`) | ❌ Increments by 33 |