diff --git a/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios.swiftinterface b/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios.swiftinterface
index e66a0f53..331560bc 100644
--- a/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios.swiftinterface
+++ b/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios.swiftinterface
@@ -131,11 +131,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -179,7 +174,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -206,7 +201,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -229,7 +224,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -264,7 +259,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-ios.swiftinterface b/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-ios.swiftinterface
index e66a0f53..331560bc 100644
--- a/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-ios.swiftinterface
+++ b/AG/AttributeGraph.xcframework/ios-arm64-arm64e/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-ios.swiftinterface
@@ -131,11 +131,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -179,7 +174,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -206,7 +201,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -229,7 +224,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -264,7 +259,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios-simulator.swiftinterface b/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios-simulator.swiftinterface
index 77913eef..bdab92ee 100644
--- a/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios-simulator.swiftinterface
+++ b/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-ios-simulator.swiftinterface
@@ -131,11 +131,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -179,7 +174,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -206,7 +201,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -229,7 +224,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -264,7 +259,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-ios-simulator.swiftinterface b/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-ios-simulator.swiftinterface
index ce1bfa9c..cec989d5 100644
--- a/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-ios-simulator.swiftinterface
+++ b/AG/AttributeGraph.xcframework/ios-arm64-x86_64-simulator/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-ios-simulator.swiftinterface
@@ -131,11 +131,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -179,7 +174,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -206,7 +201,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -229,7 +224,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -264,7 +259,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-macos.swiftinterface b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-macos.swiftinterface
index b99ab548..c8309331 100644
--- a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-macos.swiftinterface
+++ b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64-apple-macos.swiftinterface
@@ -131,11 +131,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -179,7 +174,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -206,7 +201,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -229,7 +224,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -264,7 +259,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-macos.swiftinterface b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-macos.swiftinterface
index dabd5513..46f600a4 100644
--- a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-macos.swiftinterface
+++ b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/arm64e-apple-macos.swiftinterface
@@ -131,11 +131,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -179,7 +174,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -206,7 +201,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -229,7 +224,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -264,7 +259,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-macos.swiftinterface b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-macos.swiftinterface
index c5054ded..5cc3acfa 100644
--- a/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-macos.swiftinterface
+++ b/AG/AttributeGraph.xcframework/macos-arm64e-arm64-x86_64/AttributeGraph.framework/Modules/AttributeGraph.swiftmodule/x86_64-apple-macos.swiftinterface
@@ -131,11 +131,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -179,7 +174,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -206,7 +201,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -229,7 +224,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -264,7 +259,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/AG/Sources/Modules/AttributeGraph.swiftmodule/template.swiftinterface b/AG/Sources/Modules/AttributeGraph.swiftmodule/template.swiftinterface
index 7a7d0caf..36f0142e 100644
--- a/AG/Sources/Modules/AttributeGraph.swiftmodule/template.swiftinterface
+++ b/AG/Sources/Modules/AttributeGraph.swiftmodule/template.swiftinterface
@@ -127,11 +127,6 @@ extension AGWeakAttribute {
 		set {
 			self = AGWeakAttribute(newValue)
 		}
-		_modify {
-			var value = attribute
-			yield &value
-			attribute = value
-		}
 	}
 }
 
@@ -175,7 +170,7 @@ public struct WeakAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public var wrappedValue: Value? { get }
-	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set _modify }
+	public var projectedValue: AttributeGraph.Attribute<Value>?{ get set }
 	public subscript<Member>(dynamicMember keyPath: Swift.KeyPath<Value, Member>) -> AttributeGraph.Attribute<Member>? { get }
 	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
 	public var value: Value? { get }
@@ -202,7 +197,7 @@ public struct AnyOptionalAttribute {
 	public init<Value>(_ attribute: AttributeGraph.OptionalAttribute<Value>)
 	public var identifier: AGAttribute
 	public static var current: AttributeGraph.AnyOptionalAttribute { get }
-	public var attribute: AGAttribute? { get set _modify }
+	public var attribute: AGAttribute? { get set }
 	public func map<Value>(_ body: (AGAttribute) -> Value) -> Value?
 	public func unsafeCast<Value>(to type: Value.Type) -> AttributeGraph.OptionalAttribute<Value>
 }
@@ -225,7 +220,7 @@ public struct OptionalAttribute<Value> {
 	public init(_ attribute: AttributeGraph.Attribute<Value>)
 	public init(_ attribute: AttributeGraph.Attribute<Value>?)
 	public init(_ weakAttribute: AttributeGraph.WeakAttribute<Value>)
-	public var attribute: AttributeGraph.Attribute<Value>? { get set _modify }
+	public var attribute: AttributeGraph.Attribute<Value>? { get set }
 	public var value: Value? { get }
 	public func changedValue(options: AGValueOptions = []) -> (value: Value, changed: Bool)?
 	public func map<V>(_ body: (AttributeGraph.Attribute<Value>) -> V) -> V?
@@ -260,7 +255,6 @@ public struct IndirectAttribute<Value> {
 	public var dependency: AGAttribute? {
 		get
 		nonmutating set
-		nonmutating _modify
 	}
 	public var value: Value {
 		get
diff --git a/Sources/OpenGraph/Attribute/Indirect/IndirectAttribute.swift b/Sources/OpenGraph/Attribute/Indirect/IndirectAttribute.swift
index 19af35a4..b32a77ef 100644
--- a/Sources/OpenGraph/Attribute/Indirect/IndirectAttribute.swift
+++ b/Sources/OpenGraph/Attribute/Indirect/IndirectAttribute.swift
@@ -18,11 +18,6 @@ public struct IndirectAttribute<Value> {
     public var source: Attribute<Value> {
         get { Attribute(identifier: identifier.source) }
         nonmutating set { identifier.source = newValue.identifier }
-        nonmutating _modify {
-            var value = source
-            yield &value
-            source = value
-        }
     }
     
     public var dependency: OGAttribute? {
@@ -31,17 +26,11 @@ public struct IndirectAttribute<Value> {
             return dependency == .nil ? nil : dependency
         }
         nonmutating set { identifier._indirectDependency = newValue ?? .nil }
-        nonmutating _modify {
-            var value = dependency
-            yield &value
-            dependency = value
-        }
     }
     
     public var value: Value {
         get { Attribute(identifier: identifier).value }
         nonmutating set { Attribute(identifier: identifier).value = newValue }
-        // FIXME
         nonmutating _modify { yield &Attribute<Value>(identifier: identifier).value }
     }
     
diff --git a/Sources/OpenGraph/Attribute/Optional/AnyOptionalAttribute.swift b/Sources/OpenGraph/Attribute/Optional/AnyOptionalAttribute.swift
index 0977a7bd..b710fbac 100644
--- a/Sources/OpenGraph/Attribute/Optional/AnyOptionalAttribute.swift
+++ b/Sources/OpenGraph/Attribute/Optional/AnyOptionalAttribute.swift
@@ -36,11 +36,6 @@ public struct AnyOptionalAttribute {
     public var attribute: OGAttribute? {
         get { identifier == .nil ? nil : identifier }
         set { identifier = newValue ?? .nil }
-        _modify {
-            var value = attribute
-            yield &value
-            attribute = value
-        }
     }
     
     public func map<Value>(_ body: (OGAttribute) -> Value) -> Value? {
diff --git a/Sources/OpenGraph/Attribute/Optional/OptionalAttribute.swift b/Sources/OpenGraph/Attribute/Optional/OptionalAttribute.swift
index 5caf2033..a4a1ebe5 100644
--- a/Sources/OpenGraph/Attribute/Optional/OptionalAttribute.swift
+++ b/Sources/OpenGraph/Attribute/Optional/OptionalAttribute.swift
@@ -34,11 +34,6 @@ public struct OptionalAttribute<Value> {
     public var attribute: Attribute<Value>? {
         get { base.attribute?.unsafeCast(to: Value.self) }
         set { base.attribute = newValue?.identifier }
-        _modify {
-            var value = attribute
-            yield &value
-            attribute = value
-        }
     }
     
     public var value: Value? { attribute?.value }
diff --git a/Sources/OpenGraph/Attribute/Weak/OGWeakAttribute.swift b/Sources/OpenGraph/Attribute/Weak/OGWeakAttribute.swift
index b6d5151d..8633e622 100644
--- a/Sources/OpenGraph/Attribute/Weak/OGWeakAttribute.swift
+++ b/Sources/OpenGraph/Attribute/Weak/OGWeakAttribute.swift
@@ -32,11 +32,6 @@ extension OGWeakAttribute {
         set {
             self = OGWeakAttribute(newValue)
         }
-        _modify {
-            var value = attribute
-            yield &value
-            attribute = value
-        }
     }
 }
 
diff --git a/Sources/OpenGraph/Attribute/Weak/WeakAttribute.swift b/Sources/OpenGraph/Attribute/Weak/WeakAttribute.swift
index 94b68d09..7ced3fd4 100644
--- a/Sources/OpenGraph/Attribute/Weak/WeakAttribute.swift
+++ b/Sources/OpenGraph/Attribute/Weak/WeakAttribute.swift
@@ -46,11 +46,6 @@ public struct WeakAttribute<Value> {
     public var attribute: Attribute<Value>? {
         get { base.attribute?.unsafeCast(to: Value.self) }
         set { base.attribute = newValue?.identifier }
-        _modify {
-            var value = attribute
-            yield &value
-            attribute = value
-        }
     }
     
     public var value: Value? {