task: Documentation and code improvements

Author: plajdo

Package.swift

@@ -46,11 +46,6 @@ let package = Package(
             name: "GoodReactorTests",
             dependencies: ["GoodReactor"],
             swiftSettings: [.swiftLanguageMode(.v6)]
-        ),
-        .testTarget(
-            name: "GoodCoordinatorTests",
-            dependencies: ["LegacyReactor"],
-            swiftSettings: [.swiftLanguageMode(.v6)]
         )
     ]
 )

Sources/GoodReactor/Event.swift

@@ -47,14 +47,14 @@ struct EventTaskCounter: Sendable {
     /// Increments task counter for provided event
     /// - Parameter identifier: Event starting a new task
     mutating func newTask(eventId identifier: EventIdentifier) {
-        events[identifier] = (events[identifier] ?? 0) + 1
+        events[identifier] = events[identifier, default: 0] + 1
     }
 
     /// Decrements task counter for provided event
     /// - Parameter identifier: Event stopping the task
     /// - Returns: Number of remaining tasks
     mutating func stopTask(eventId identifier: EventIdentifier) -> Int {
-        let taskCount = events[identifier] ?? 0
+        let taskCount = events[identifier, default: 0]
         let newTaskCount = taskCount - 1
 
         events[identifier] = newTaskCount

Sources/GoodReactor/Stub.swift

@@ -7,6 +7,9 @@
 
 import Observation
 
+/// Stub is a ``Reactor`` implementation adjusted for use in Xcode previews
+/// to mock different states of the UI. Stub resolves the state at initialization and
+/// supports small changes to state in its `reducer`.
 @available(iOS 17.0, macOS 14.0, *)
 @Observable public final class Stub<R: Reactor>: Reactor {
 
@@ -29,7 +32,11 @@ import Observation
     public func reduce(state: inout R.State, event: Event) {
         reducer?(&state, event)
     }
-
+    
+    /// Initializes a Stub ``Reactor`` with state and a simple reducer.
+    /// - Parameters:
+    ///   - supplier: Closure supplying initial mocked state
+    ///   - reducer: Closure reducing small changes to mocked state
     public init(
         supplier: @escaping (() -> (R.State)),
         reducer: ((inout R.State, Event) -> ())? = nil