Breaking change: test stores will now catch assertions that do not change state (thanks @rcarver).

// Before:
store.send(.actionThatDoesntChangeState) { $0.state = .sameStateAsBefore }
// ✅

// After:
store.send(.actionThatDoesntChangeState) { $0.state = .sameStateAsBefore }
// ❌ Expected to modify the expected state, but no change occurred.

To fix, remove the trailing closure assertion to let the test store know you don't expect its state to change:

store.send(.actionThatDoesntChangeState)
// ✅

Added: Effect cancellation endpoints can now take types as identifiers, a slightly simpler alternative to safely defining and instantiating a hashable type:

// Before:
struct CancelId: Hashable {}
return .cancel(id: CancelId())

// After:
enum CancelId {}
return .cancel(id: CancelId.self)

Added: A new overload of eraseToEffect that takes a transform function. This provides symmetry to catchToEffect and can help streamline effect work in the reducer (thanks @klundberg).

// Before:
return environment.doSomething()
  .map(Action.case)
  .eraseToEffect()

// After:
return environment.doSomething()
  .eraseToEffect(Action.case)

Added: A new overload of Effect.fireAndForget that takes an async, throwing function.

return .fireAndForget {
  try await environment.analytics(event: .tappedProfile)
}

Changed: The synchronous version of Effect.fireAndForget can now throw, which will simply terminate the effect's execution early if an error is thrown.

Changed: Runtime warnings should now show up closer to the source of the warning (thanks @iampatbrown).

Changed: When multiple TestStore failure messages stack, they should print in a better, more readable order.

Changed: Case Paths has been pinned to a newer version (thanks @nsillik).

Fixed: A bug in which the array-based overload of Effect.cancel(ids:) was not being favored over the variadic overload would treat the entire array as the cancel token and not each individual item has been fixed (thanks @iampatbrown).

Fixed: A few small warnings that show up in Swift 5.7 have been fixed.

Performance: Effect cancellation lookup has been improved for type-safe identifiers.

Infrastructure: Fixed SPI's config file (thanks @finestructure).

Infrastructure: The long-living effect SwiftUI case study has been modernized and simplified.