diff --git a/IGListKit.xcodeproj/project.pbxproj b/IGListKit.xcodeproj/project.pbxproj
index b7bf8bf6..6ad729dc 100644
--- a/IGListKit.xcodeproj/project.pbxproj
+++ b/IGListKit.xcodeproj/project.pbxproj
@@ -375,7 +375,7 @@
 		88144F1B1D870EDC007C7F66 /* IGTestSingleItemDataSource.m in Sources */ = {isa = PBXBuildFile; fileRef = 88144F021D870EDC007C7F66 /* IGTestSingleItemDataSource.m */; };
 		88144F1D1D870EDC007C7F66 /* IGTestSupplementarySource.m in Sources */ = {isa = PBXBuildFile; fileRef = 88144F061D870EDC007C7F66 /* IGTestSupplementarySource.m */; };
 		882BC1321E0118CB0083B311 /* IGTestObject.m in Sources */ = {isa = PBXBuildFile; fileRef = 88144F001D870EDC007C7F66 /* IGTestObject.m */; };
-		883797082022304E00B94676 /* BuildFile in Headers */ = {isa = PBXBuildFile; };
+		883797082022304E00B94676 /* (null) in Headers */ = {isa = PBXBuildFile; };
 		88379728202236AB00B94676 /* IGListAdapterUpdateTester.m in Sources */ = {isa = PBXBuildFile; fileRef = 294CDE621F995DD7002CF6E4 /* IGListAdapterUpdateTester.m */; };
 		88379729202236AC00B94676 /* IGListAdapterUpdateTester.m in Sources */ = {isa = PBXBuildFile; fileRef = 294CDE621F995DD7002CF6E4 /* IGListAdapterUpdateTester.m */; };
 		885FE1DD1DC51A0D009CE2B4 /* IGListKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 885FE1D41DC51A0D009CE2B4 /* IGListKit.framework */; };
@@ -418,6 +418,8 @@
 		E56B7B3420A9D7100071010C /* IGListCollectionScrollingTraitsTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E56B7B3320A9D7100071010C /* IGListCollectionScrollingTraitsTests.m */; };
 		E56B7B3520A9D7100071010C /* IGListCollectionScrollingTraitsTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E56B7B3320A9D7100071010C /* IGListCollectionScrollingTraitsTests.m */; };
 		E8D312E01FC472A60009FA2F /* IGListContentInsetTests.m in Sources */ = {isa = PBXBuildFile; fileRef = E8D312DF1FC472A60009FA2F /* IGListContentInsetTests.m */; };
+		F102DBBB2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m in Sources */ = {isa = PBXBuildFile; fileRef = F102DBBA2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m */; };
+		F102DBBC2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m in Sources */ = {isa = PBXBuildFile; fileRef = F102DBBA2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m */; };
 		F1855A4C29BC565600558D18 /* IGListDiffDescriptionStringTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F1855A4B29BC565600558D18 /* IGListDiffDescriptionStringTests.m */; };
 		F1855A4D29BC565600558D18 /* IGListDiffDescriptionStringTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F1855A4B29BC565600558D18 /* IGListDiffDescriptionStringTests.m */; };
 		F1855A4E29BC565600558D18 /* IGListDiffDescriptionStringTests.m in Sources */ = {isa = PBXBuildFile; fileRef = F1855A4B29BC565600558D18 /* IGListDiffDescriptionStringTests.m */; };
@@ -749,6 +751,7 @@
 		DD3152AC1DE227FA00AC9D2C /* IGListKit.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = IGListKit.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		E56B7B3320A9D7100071010C /* IGListCollectionScrollingTraitsTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = IGListCollectionScrollingTraitsTests.m; sourceTree = "<group>"; };
 		E8D312DF1FC472A60009FA2F /* IGListContentInsetTests.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = IGListContentInsetTests.m; sourceTree = "<group>"; };
+		F102DBBA2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = IGListArrayUtilsInternal.m; sourceTree = "<group>"; };
 		F1855A4B29BC565600558D18 /* IGListDiffDescriptionStringTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = IGListDiffDescriptionStringTests.m; sourceTree = "<group>"; };
 		F18CC75B29EFBB9400DC3B9A /* IGListCollectionViewTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = IGListCollectionViewTests.m; sourceTree = "<group>"; };
 		F18CC75E29EFBBB300DC3B9A /* IGListBindingSingleSectionControllerTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = IGListBindingSingleSectionControllerTests.m; sourceTree = "<group>"; };
@@ -946,6 +949,7 @@
 				7AD6864923A89E7F009000DE /* IGListAdapterUpdaterHelpers.m */,
 				7A02CF702361513400B49FAE /* IGListAdapterUpdaterInternal.h */,
 				7A02CF812361513500B49FAE /* IGListArrayUtilsInternal.h */,
+				F102DBBA2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m */,
 				7A02CF8C2361513500B49FAE /* IGListBatchUpdateData+DebugDescription.h */,
 				7A02CF7C2361513400B49FAE /* IGListBatchUpdateData+DebugDescription.m */,
 				7A02CF782361513400B49FAE /* IGListBatchUpdateState.h */,
@@ -1436,7 +1440,7 @@
 			isa = PBXHeadersBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				883797082022304E00B94676 /* BuildFile in Headers */,
+				883797082022304E00B94676 /* (null) in Headers */,
 				7A02D0C023615CE500B49FAE /* IGListKit.h in Headers */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -1923,6 +1927,7 @@
 				7A92EAB523A8A5FF00E5A13D /* IGListAdapterUpdaterHelpers.m in Sources */,
 				7A02CFD92361513600B49FAE /* IGListBatchUpdateData+DebugDescription.m in Sources */,
 				7A02CFAF2361513600B49FAE /* UICollectionViewLayout+InteractiveReordering.m in Sources */,
+				F102DBBC2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -2041,6 +2046,7 @@
 				7AD6864B23A89E7F009000DE /* IGListAdapterUpdaterHelpers.m in Sources */,
 				7A02CFD82361513600B49FAE /* IGListBatchUpdateData+DebugDescription.m in Sources */,
 				7A02CFAE2361513600B49FAE /* UICollectionViewLayout+InteractiveReordering.m in Sources */,
+				F102DBBB2ACE4CD500394DB7 /* IGListArrayUtilsInternal.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/Source/IGListKit/Internal/IGListArrayUtilsInternal.h b/Source/IGListKit/Internal/IGListArrayUtilsInternal.h
index a2411477..2e77e317 100644
--- a/Source/IGListKit/Internal/IGListArrayUtilsInternal.h
+++ b/Source/IGListKit/Internal/IGListArrayUtilsInternal.h
@@ -5,34 +5,11 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#ifndef IGListArrayUtilsInternal_h
-#define IGListArrayUtilsInternal_h
+#import <Foundation/Foundation.h>
 
-#if !__has_include(<IGListDiffKit/IGListDiffKit.h>)
-#import "IGListBatchUpdateData.h"
-#else
-#import <IGListDiffKit/IGListBatchUpdateData.h>
-#endif
+@protocol IGListDiffable;
 
-static NSArray *objectsWithDuplicateIdentifiersRemoved(NSArray<id<IGListDiffable>> *objects) {
-    if (objects == nil) {
-        return nil;
-    }
-
-    NSMapTable *identifierMap = [NSMapTable strongToStrongObjectsMapTable];
-    NSMutableArray *uniqueObjects = [NSMutableArray new];
-    for (id<IGListDiffable> object in objects) {
-        id diffIdentifier = [object diffIdentifier];
-        id previousObject = [identifierMap objectForKey:diffIdentifier];
-        if (diffIdentifier != nil
-            && previousObject == nil) {
-            [identifierMap setObject:object forKey:diffIdentifier];
-            [uniqueObjects addObject:object];
-        } else {
-            IGLKLog(@"Duplicate identifier %@ for object %@ with object %@", diffIdentifier, object, previousObject);
-        }
-    }
-    return uniqueObjects;
-}
-
-#endif /* IGListArrayUtilsInternal_h */
+/// Returns a copy of the provided array, with all duplicates 
+/// of objects with the same `diffIdentifier` value removed.
+/// - Parameter objects: The list of diffable objects to filter.
+NSArray *objectsWithDuplicateIdentifiersRemoved(NSArray<id<IGListDiffable>> *objects);
diff --git a/Source/IGListKit/Internal/IGListArrayUtilsInternal.m b/Source/IGListKit/Internal/IGListArrayUtilsInternal.m
new file mode 100644
index 00000000..86736169
--- /dev/null
+++ b/Source/IGListKit/Internal/IGListArrayUtilsInternal.m
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import "IGListArrayUtilsInternal.h"
+
+#if !__has_include(<IGListDiffKit/IGListDiffKit.h>)
+#import "IGListBatchUpdateData.h"
+#import "IGListDiffable.h"
+#else
+#import <IGListDiffKit/IGListBatchUpdateData.h>
+#import <IGListDiffKit/IGListDiffable.h>
+#endif
+
+NSArray *objectsWithDuplicateIdentifiersRemoved(NSArray<id<IGListDiffable>> *objects) {
+    if (objects == nil) {
+        return nil;
+    }
+
+    NSMapTable *identifierMap = [NSMapTable strongToStrongObjectsMapTable];
+    NSMutableArray *uniqueObjects = [NSMutableArray new];
+    for (id<IGListDiffable> object in objects) {
+        id diffIdentifier = [object diffIdentifier];
+        id previousObject = [identifierMap objectForKey:diffIdentifier];
+        if (diffIdentifier != nil
+            && previousObject == nil) {
+            [identifierMap setObject:object forKey:diffIdentifier];
+            [uniqueObjects addObject:object];
+        } else {
+            IGLKLog(@"Duplicate identifier %@ for object %@ with object %@", diffIdentifier, object, previousObject);
+        }
+    }
+    return uniqueObjects;
+}