diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..16e143c
Binary files /dev/null and b/.DS_Store differ
diff --git a/Sources/Extensions/CALayer+PinLayout.swift b/Sources/Extensions/CALayer+PinLayout.swift
index 698e610..7eb92be 100644
--- a/Sources/Extensions/CALayer+PinLayout.swift
+++ b/Sources/Extensions/CALayer+PinLayout.swift
@@ -20,10 +20,6 @@
 import QuartzCore
 
 extension CALayer: Layoutable {
-    private struct pinlayoutAssociatedKeys {
-        static var pinlayoutIsIncludedInPinLayoutSizeCalculation = UnsafeMutablePointer<Int8>.allocate(capacity: 1)
-    }
-
     public typealias PinView = CALayer
 
     public var superview: CALayer? {
@@ -42,15 +38,6 @@ extension CALayer: Layoutable {
         return PinLayout(view: self, keepTransform: false)
     }
 
-    public var isIncludedInPinLayoutSizeCalculation: Bool {
-        get {
-            return objc_getAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInPinLayoutSizeCalculation) as? Bool ?? true
-        }
-        set {
-            objc_setAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInPinLayoutSizeCalculation, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
-        }
-    }
-
     public func getRect(keepTransform: Bool) -> CGRect {
         if keepTransform {
             /*
diff --git a/Sources/Extensions/NSView+PinLayout.swift b/Sources/Extensions/NSView+PinLayout.swift
index 0b55fe5..ee81f9a 100644
--- a/Sources/Extensions/NSView+PinLayout.swift
+++ b/Sources/Extensions/NSView+PinLayout.swift
@@ -23,10 +23,6 @@ import Foundation
 import AppKit
 
 extension NSView: Layoutable {
-    private struct pinlayoutAssociatedKeys {
-        static var pinlayoutIsIncludedInPinLayoutSizeCalculation = UnsafeMutablePointer<Int8>.allocate(capacity: 1)
-    }
-  
     public typealias PinView = NSView
 
     public var pin: PinLayout<NSView> {
@@ -41,15 +37,6 @@ extension NSView: Layoutable {
         return PinLayoutObjCImpl(view: self, keepTransform: true)
     }
 
-    public var isIncludedInPinLayoutSizeCalculation: Bool {
-        get {
-            return objc_getAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInPinLayoutSizeCalculation) as? Bool ?? true
-        }
-        set {
-            objc_setAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInPinLayoutSizeCalculation, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
-        }
-    }
-
     public func getRect(keepTransform: Bool) -> CGRect {
         if let superview = superview, !superview.isFlipped {
             var flippedRect = frame
diff --git a/Sources/Extensions/UIView+PinLayout.swift b/Sources/Extensions/UIView+PinLayout.swift
index 9188f83..d6a7e10 100644
--- a/Sources/Extensions/UIView+PinLayout.swift
+++ b/Sources/Extensions/UIView+PinLayout.swift
@@ -37,15 +37,6 @@ extension UIView: Layoutable, SizeCalculable {
         return PinLayoutObjCImpl(view: self, keepTransform: true)
     }
 
-    public var isIncludedInPinLayoutSizeCalculation: Bool {
-        get {
-            return objc_getAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInPinLayoutSizeCalculation) as? Bool ?? true
-        }
-        set {
-            objc_setAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInPinLayoutSizeCalculation, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
-        }
-    }
-
     public func getRect(keepTransform: Bool) -> CGRect {
         guard !Pin.autoSizingInProgress || autoSizingRect == nil else { return autoSizingRect ?? CGRect.zero }
 
@@ -104,7 +95,6 @@ extension UIView: Layoutable, SizeCalculable {
 
 extension UIView: AutoSizeCalculable {
     private struct pinlayoutAssociatedKeys {
-        static var pinlayoutIsIncludedInPinLayoutSizeCalculation = UnsafeMutablePointer<Int8>.allocate(capacity: 1)
         static var pinlayoutAutoSizingRect = UnsafeMutablePointer<Int8>.allocate(capacity: 1)
         static var pinlayoutAutoSizingRectWithMargins = UnsafeMutablePointer<Int8>.allocate(capacity: 1)
     }
diff --git a/Sources/Layoutable.swift b/Sources/Layoutable.swift
index d1fd835..cb70407 100644
--- a/Sources/Layoutable.swift
+++ b/Sources/Layoutable.swift
@@ -29,13 +29,6 @@ public protocol Layoutable: AnyObject, Equatable, CustomDebugStringConvertible {
     var superview: PinView? { get }
     var subviews: [PinView] { get }
 
-    /// A Boolean value that determines whether the view is included in the PinLayout's size calculation.
-    ///
-    /// An excluded view does not take up space in the layout
-    /// when using `wrapContent(_:padding:_:)` or `autoSizeThatFits(_:layoutClosure:)`.
-    /// The default value is `true`.
-    var isIncludedInPinLayoutSizeCalculation: Bool { get set }
-
     func getRect(keepTransform: Bool) -> CGRect
     func setRect(_ rect: CGRect, keepTransform: Bool)
 
@@ -44,8 +37,22 @@ public protocol Layoutable: AnyObject, Equatable, CustomDebugStringConvertible {
     func isLTR() -> Bool
 }
 
+private struct pinlayoutAssociatedKeys {
+    static var pinlayoutIsIncludedInSizeCalculation = UnsafeMutablePointer<Int8>.allocate(capacity: 1)
+}
+
 extension Layoutable {
+
+    var isIncludedInSizeCalculation: Bool {
+        get {
+            return objc_getAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInSizeCalculation) as? Bool ?? true
+        }
+        set {
+            objc_setAssociatedObject(self, &pinlayoutAssociatedKeys.pinlayoutIsIncludedInSizeCalculation, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
+        }
+    }
+
     var subviewsIncludedInSizeCalculation: [PinView] {
-        return subviews.filter(\.isIncludedInPinLayoutSizeCalculation)
+        return subviews.filter(\.isIncludedInSizeCalculation)
     }
 }
diff --git a/Sources/PinLayout.swift b/Sources/PinLayout.swift
index 33d79e3..41b78ef 100644
--- a/Sources/PinLayout.swift
+++ b/Sources/PinLayout.swift
@@ -84,6 +84,16 @@ public class PinLayout<PinView: Layoutable> {
         apply()
     }
 
+    /// A Boolean value that determines whether the view is included in the PinLayout's size calculation.
+    ///
+    /// An excluded view does not take up space in the layout
+    /// when using `wrapContent(_:padding:_:)` or `autoSizeThatFits(_:layoutClosure:)`.
+    /// The default value is `true`.
+    public var isIncludedInSizeCalculation: Bool {
+        get { return view.isIncludedInSizeCalculation }
+        set { view.isIncludedInSizeCalculation = newValue }
+    }
+
     #if os(iOS) || os(tvOS)
     public var safeArea: PEdgeInsets {
         if let view = view as? UIView {