diff --git a/Sources/Defaults/Defaults+Bridge.swift b/Sources/Defaults/Defaults+Bridge.swift
index b1da6fc..c38a36b 100644
--- a/Sources/Defaults/Defaults+Bridge.swift
+++ b/Sources/Defaults/Defaults+Bridge.swift
@@ -428,7 +428,7 @@ extension Defaults {
 }
 
 extension Defaults {
-	public struct AnyBridge: Defaults.Bridge, Sendable {
+	public struct AnyBridge: Bridge, Sendable {
 		public typealias Value = Defaults.AnySerializable
 		public typealias Serializable = Any
 
diff --git a/Sources/Defaults/Defaults.swift b/Sources/Defaults/Defaults.swift
index 79aefa3..54c0114 100644
--- a/Sources/Defaults/Defaults.swift
+++ b/Sources/Defaults/Defaults.swift
@@ -209,9 +209,9 @@ extension Defaults.Key {
 
 extension Defaults.Key where Value: Equatable {
 	/**
-	Check whether the stored value is the default value.
+	Indicates whether the value is the same as the default value.
 	*/
-	public var isDefaultValue: Bool { self._isDefaultValue }
+	public var isDefaultValue: Bool { suite[self] == defaultValue }
 }
 
 extension Defaults {
diff --git a/Sources/Defaults/Observation.swift b/Sources/Defaults/Observation.swift
index 89375cd..b33723a 100644
--- a/Sources/Defaults/Observation.swift
+++ b/Sources/Defaults/Observation.swift
@@ -287,11 +287,16 @@ extension Defaults {
 		}
 
 		func start(options: ObservationOptions) {
-			observations.forEach { $0.start(options: options) }
+			for observation in observations {
+				observation.start(options: options)
+			}
 		}
 
 		func invalidate() {
-			observations.forEach { $0.invalidate() }
+			for observation in observations {
+				observation.invalidate()
+			}
+
 			lifetimeAssociation?.cancel()
 		}
 
@@ -305,7 +310,7 @@ extension Defaults {
 		}
 
 		func remove(key: Defaults._AnyKey) {
-			guard let observation = observations.remove(DefaultsObservation(key: key, self.callback)) else {
+			guard let observation = observations.remove(DefaultsObservation(key: key, callback)) else {
 				return
 			}
 
diff --git a/Sources/Defaults/SwiftUI.swift b/Sources/Defaults/SwiftUI.swift
index cf3e76c..d1d8488 100644
--- a/Sources/Defaults/SwiftUI.swift
+++ b/Sources/Defaults/SwiftUI.swift
@@ -32,7 +32,7 @@ extension Defaults {
 			task?.cancel()
 		}
 
-		func observe() {
+		private func observe() {
 			// We only use this on the latest OSes (as of adding this) since the backdeploy library has a lot of bugs.
 			if #available(macOS 13, iOS 16, tvOS 16, watchOS 9, visionOS 1.0, *) {
 				task?.cancel()
@@ -44,7 +44,7 @@ extension Defaults {
 							return
 						}
 
-						self.objectWillChange.send()
+						objectWillChange.send()
 					}
 				}
 			} else {
@@ -221,12 +221,26 @@ extension Defaults {
 }
 
 extension Defaults.Toggle<Text> {
-	public init(_ title: some StringProtocol, key: Defaults.Key<Bool>) {
+	public init(
+		_ title: some StringProtocol,
+		key: Defaults.Key<Bool>
+	) {
 		self.label = { Text(title) }
 		self.observable = .init(key)
 	}
 }
 
+extension Defaults.Toggle<Label<Text, Image>> {
+	public init(
+		_ title: some StringProtocol,
+		systemImage: String,
+		key: Defaults.Key<Bool>
+	) {
+		self.label = { Label(title, systemImage: systemImage) }
+		self.observable = .init(key)
+	}
+}
+
 extension Defaults.Toggle {
 	/**
 	Do something when the value changes to a different value.
diff --git a/Tests/DefaultsTests/DefaultsTests.swift b/Tests/DefaultsTests/DefaultsTests.swift
index 091b47b..8775016 100644
--- a/Tests/DefaultsTests/DefaultsTests.swift
+++ b/Tests/DefaultsTests/DefaultsTests.swift
@@ -771,7 +771,7 @@ final class DefaultsTests: XCTestCase {
 
 		async let waiter = Defaults.updates(key, initial: false).first { $0 }
 
-		try? await Task.sleep(seconds: 0.1)
+		try? await Task.sleep(for: .seconds(0.1))
 
 		Defaults[key] = true
 
@@ -798,7 +798,7 @@ final class DefaultsTests: XCTestCase {
 			}
 		}()
 
-		try? await Task.sleep(seconds: 0.1)
+		try? await Task.sleep(for: .seconds(0.1))
 
 		Defaults[key1] = true
 		Defaults[key2] = true
@@ -820,10 +820,4 @@ actor Counter {
 	}
 }
 
-// TODO: Remove when testing on macOS 13.
-extension Task<Never, Never> {
-	static func sleep(seconds: TimeInterval) async throws {
-		try await sleep(nanoseconds: UInt64(seconds * Double(NSEC_PER_SEC)))
-	}
-}
 // swiftlint:enable discouraged_optional_boolean
diff --git a/readme.md b/readme.md
index 1052269..3dafd90 100644
--- a/readme.md
+++ b/readme.md
@@ -6,7 +6,7 @@ Store key-value pairs persistently across launches of your app.
 
 It uses `UserDefaults` underneath but exposes a type-safe facade with lots of nice conveniences.
 
-It's used in production by [all my apps](https://sindresorhus.com/apps) (1 million+ users).
+It's used in production by [all my apps](https://sindresorhus.com/apps) (4 million+ users).
 
 ## Highlights