Xcode tests seems to largely ignore package's unsafeFlags

Using Swift
1

I'm trying to profile some code in my Swift package (in this case, to profile how much of the overhead I'm seeing is from Swift exclusive access enforcement), but Xcode seems to ignore any unsafeFlags I provide.

//  ...

.target(
    name: "MyPackage",
    dependencies: [ ],
    swiftSettings: [
        .unsafeFlags(["-enforce-exclusivity=unchecked"])
    ]
),

.testTarget(
    name: "Tests",
    dependencies: [ "MyPackage" ],
    path: "Tests",
    swiftSettings: [
        .unsafeFlags(["-enforce-exclusivity=unchecked"])
    ]
),

// ...

Am I doing something wrong?