Fix UseConnection argument validation.

[michaelstaib]

Fixes #8943

[github-actions]

Fusion Gateway Performance Results

Simple Composite Query

	Req/s	Err%
Constant (50 VUs)	2960.60	0.00%
Ramping (0-500-0 VUs)	3194.78	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.73ms	14.80ms	16.66ms	30.45ms	36.07ms	172.85ms
Ramping	0.81ms	68.31ms	69.72ms	128.79ms	143.23ms	266.37ms

query TestQuery {
  topProducts(first: 5) {
    inStock
    name
    price
    shippingEstimate
    upc
    weight
    reviews {
      id
      body
      author {
        id
        username
        name
      }
    }
  }
}

---

Deep Recursion Query

	Req/s	Err%
Constant (50 VUs)	744.69	0.00%
Ramping (0-500-0 VUs)	813.35	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	9.25ms	62.45ms	65.64ms	80.89ms	89.37ms	337.44ms
Ramping	1.82ms	254.41ms	263.93ms	529.21ms	566.65ms	688.96ms

query TestQuery {
  users {
    id
    username
    name
    reviews {
      id
      body
      product {
        inStock
        name
        price
        shippingEstimate
        upc
        weight
        reviews {
          id
          body
          author {
            id
            username
            name
            reviews {
              id
              body
              product {
                inStock
                name
                price
                shippingEstimate
                upc
                weight
              }
            }
          }
        }
      }
    }
  }
  topProducts(first: 5) {
    inStock
    name
    price
    shippingEstimate
    upc
    weight
    reviews {
      id
      body
      author {
        id
        username
        name
        reviews {
          id
          body
          product {
            inStock
            name
            price
            shippingEstimate
            upc
            weight
          }
        }
      }
    }
  }
}

---

Variable Batching Throughput

	Req/s	Err%
Constant (50 VUs)	23153.97	0.00%
Ramping (0-500-0 VUs)	18394.91	0.00%

Response Times & Query

	Min	Med	Avg	P90	P95	Max
Constant	0.10ms	1.74ms	2.11ms	4.02ms	4.91ms	68.88ms
Ramping	0.10ms	9.50ms	11.54ms	23.60ms	28.56ms	118.71ms

query TestQuery($upc: ID!, $price: Long!, $weight: Long!) {
  productByUpc(upc: $upc) {
    inStock
    shippingEstimate(weight: $weight, price: $price)
  }
}

Variables (5 sets batched per request)

[
  { "upc": "1", "price": 899, "weight": 100 },
  { "upc": "2", "price": 1299, "weight": 1000 },
  { "upc": "3", "price": 15, "weight": 20 },
  { "upc": "4", "price": 499, "weight": 100 },
  { "upc": "5", "price": 1299, "weight": 1000 }
]

---

Run 22146868257 • Commit 0e53f49 • Wed, 18 Feb 2026 16:37:38 GMT