Do not coerce field value for Optional<T> with default value

[tobias-tengler]

No description provided.

[Copilot]

Pull request overview

This pull request fixes an issue where Optional fields with default values were incorrectly having their values set when not explicitly provided in the input. The fix ensures that Optional fields maintain their "unset" state (HasValue=false) when not provided, allowing consumers to distinguish between "field not provided" vs "field provided with default value".

Changes:

• Modified variable coercion logic to skip default value assignment for Optional fields
• Added comprehensive test coverage for the new behavior
• Fixed a typo in test class name (VariableBatchRequestTestss → VariableBatchRequestTests)
• Removed unused Empty property from OperationRequest and VariableBatchRequest classes

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
VariableCoercionHelper.cs	Updated field default value logic to exclude Optional fields (IsOptional: false check)
VariableCoercionHelperTests.cs	Added test verifying Optional fields with defaults remain unset when not provided
VariableBatchRequestTests.cs	Fixed typo in class name (removed extra 's')
VariableBatchRequest.cs	Removed unused Empty static property
OperationRequest.cs	Removed unused Empty static property

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[github-actions]

🚀 Fusion Gateway Performance Results

Simple Composite Query

Constant Load (50 VUs)

Requests/sec	Error Rate
2919.99 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.78ms	14.91ms	172.89ms	16.90ms	31.38ms	36.89ms

Ramping Load (0→50→500→50 VUs)

Requests/sec	Error Rate
3342.95 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.86ms	65.94ms	244.07ms	66.61ms	124.25ms	139.37ms

Executed Query

fragment User on User {
  id
  username
  name
}

fragment Review on Review {
  id
  body
}

fragment Product on Product {
  inStock
  name
  price
  shippingEstimate
  upc
  weight
}

query TestQuery {
  topProducts(first: 5) {
    ...Product
    reviews {
      ...Review
      author {
        ...User
      }
    }
  }
}

Deep Recursion Query

Constant Load (50 VUs)

Requests/sec	Error Rate
747.90 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
8.35ms	62.64ms	375.52ms	65.35ms	80.99ms	88.94ms

Ramping Load (0→50→500→50 VUs)

Requests/sec	Error Rate
821.31 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
1.84ms	253.97ms	690.11ms	260.99ms	520.88ms	559.90ms

Executed Query

fragment User on User {
  id
  username
  name
}

fragment Review on Review {
  id
  body
}

fragment Product on Product {
  inStock
  name
  price
  shippingEstimate
  upc
  weight
}

query TestQuery {
  users {
    ...User
    reviews {
      ...Review
      product {
        ...Product
        reviews {
          ...Review
          author {
            ...User
            reviews {
              ...Review
              product {
                ...Product
              }
            }
          }
        }
      }
    }
  }
  topProducts(first: 5) {
    ...Product
    reviews {
      ...Review
      author {
        ...User
        reviews {
          ...Review
          product {
            ...Product
          }
        }
      }
    }
  }
}

Variable Batching Throughput

Constant Load (50 VUs)

Requests/sec	Error Rate
23166.50 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.10ms	1.74ms	45.60ms	2.11ms	4.03ms	4.90ms

Ramping Load (0→50→500→50 VUs)

Requests/sec	Error Rate
18244.39 req/s	0.00%

📊 Response Time Metrics

Min	Med	Max	Avg	P90	P95
0.10ms	9.61ms	106.54ms	11.61ms	23.89ms	28.95ms

Executed Query

query TestQuery_8f7a46ce_2(
  $__fusion_1_upc: ID!
  $__fusion_2_price: Long!
  $__fusion_2_weight: Long!
) {
  productByUpc(upc: $__fusion_1_upc) {
    inStock
    shippingEstimate(weight: $__fusion_2_weight, price: $__fusion_2_price)
  }
}

Variables (5 sets batched in single request)

[
  { "__fusion_1_upc": "1", "__fusion_2_price": 899, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "2", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 },
  { "__fusion_1_upc": "3", "__fusion_2_price": 15, "__fusion_2_weight": 20 },
  { "__fusion_1_upc": "4", "__fusion_2_price": 499, "__fusion_2_weight": 100 },
  { "__fusion_1_upc": "5", "__fusion_2_price": 1299, "__fusion_2_weight": 1000 }
]

No baseline data available for comparison.

---

Run 22134358990 • Commit b1f5e5b • Wed, 18 Feb 2026 10:26:51 GMT