Namespaced cache with memory driver revert serialize to true

[JosephMarotte]

I’m hitting the following issue when I’m using bentocache 1.6.1 as a memory cache with serialize to false.
Namespaced cache created from the initial cache do not preserve the serialize property

A possible workaround is to use tags and not rely on namespaces

You can find below a test generated by LLM that exhibit this behavior.

import { test } from '@japa/runner'
import { BentoCache, bentostore } from 'bentocache'
import { memoryDriver } from 'bentocache/drivers/memory'

test.group('bentocache namespace() + serialize:false interaction', () => {
  test('non-namespaced getOrSet preserves a Map value across a cache hit', async ({ assert }) => {
    const cache = new BentoCache({
      default: 'memory',
      stores: {
        memory: bentostore().useL1Layer(memoryDriver({ maxItems: 100, serialize: false })),
      },
    }).use('memory')

    await cache.getOrSet({ key: 'foo', factory: async () => new Map([['a', 1]]) })
    const hit = await cache.getOrSet({
      key: 'foo',
      factory: async () => {
        throw new Error('should have been served from cache')
      },
    })

    assert.instanceOf(hit, Map)
  })

  test('KNOWN BUG: namespaced getOrSet does NOT preserve a Map value across a cache hit', async ({
    assert,
  }) => {
    const cache = new BentoCache({
      default: 'memory',
      stores: {
        memory: bentostore().useL1Layer(memoryDriver({ maxItems: 100, serialize: false })),
      },
    }).use('memory')

    const nsCache = cache.namespace("ns");

    await nsCache.getOrSet({ key: 'bar', factory: async () => new Map([['a', 1]]) })
    const hit = await nsCache.getOrSet({
      key: 'bar',
      factory: async () => {
        throw new Error('should have been served from cache')
      },
    })

    // Expected outcome given the bug: the Map got JSON-round-tripped into `{}`.
    assert.notInstanceOf(hit, Map)
  })
})

The cache-driver page have information about not setting serialize: false with an L2 cache but I have none set-up here.