             ).wait(),
             GraphQLResult(data: [
                 "echo": [
-                    "field1": "defaultValue1"
+                    "field1": .null
                 ]
             ])
         )

                    "field1": "defaultValue1"
                ]
            ])
        )
    }
    

            try graphql(
                schema: schema,
                request: """
                query echo($field1: String = "defaultValue1") {
                    echo (
                        field1: $field1
                    ) {
                        field1
                    }
                }
                """,
                eventLoopGroup: group,
                variableValues: [:]
            ).wait(),
            GraphQLResult(data: [
                "echo": [
                    "field1": "defaultValue1"
                ]
            ])
        )
        
        // Test that nullable unprovided variables are coerced to null
        XCTAssertEqual(
            try graphql(
                schema: schema,
                request: """
                query echo($field1: String) {
                    echo (
                        field1: $field1
