Validation of search params shows non-working example

[ghost]

In the docs under Search Params it is noted that validation can be done via as:

// /routes/shop.products.tsx

type ProductSearchSortOptions = 'newest' | 'oldest' | 'price'

type ProductSearch = {
  page: number
  filter: string
  sort: ProductSearchSortOptions
}

export const Route = createFileRoute('/shop/products')({
  validateSearch: (search: Record<string, unknown>): ProductSearch => {
    // validate and parse the search params into a typed state
    return {
      page: Number(search?.page ?? 1),
      filter: (search.filter as string) || '',
      sort: (search.sort as ProductSearchSortOptions) || 'newest',
    }
  },
})

Why would a check for page work if I input ?page=test? I do not see the value of this, this is rather defining optional search parameters with default values, but if I input ?sort='rating' this may crash depending on further code asserting that sort is only one of 'newest' | 'oldest' | 'price'. Am I wrong? Is this example showing something else?