diff --git a/CHANGELOG.md b/CHANGELOG.md
index b6f143abd..a23b27f35 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ The changelog for `IGListKit`. Also see the [releases](https://github.com/instag
 
 - Removed unneeded diffing functions `IGListDiffExperiment(...)` and `IGListDiffPathsExperiment(...)`. [Maxime Ollivier](https://github.com/maxolls) (tbd)
 
+- `ListSectionController.collectionContext` and `ListGenericSectionController.object` are now implicitly-unwrapped optionals in Swift. [Nate Stedman](https://github.com/natestedman) (tbd)
+
+- The argument of `IGListGenericSectionController`'s `-didUpdateToObject:` is now generic, not `id`. [Nate Stedman](https://github.com/natestedman) (tbd)
+
 ### Enhancements
 
 - Introduce `IGListSwiftKit`, with Swift refinements for `dequeueReusableCellOfClass` methods. [Koen Punt](https://github.com/koenpunt) [(#1388)](https://github.com/Instagram/IGListKit/pull/1388).
diff --git a/Source/IGListKit/IGListGenericSectionController.h b/Source/IGListKit/IGListGenericSectionController.h
index e0cf25e13..25f84e3b7 100644
--- a/Source/IGListKit/IGListGenericSectionController.h
+++ b/Source/IGListKit/IGListGenericSectionController.h
@@ -22,9 +22,10 @@ NS_SWIFT_NAME(ListGenericSectionController)
  returned.
 
  @note This object is briefly `nil` between initialization and the first call to `didUpdateToObject:`. After that, it is
- safe to assume that this is non-`nil`.
+ safe to assume that this is non-`nil`. For this reason, we bridge it to Swift as an implicitly-unwrapped Optional, so
+ that idiomatic IGListKit code is not forced to handle nullability with explicit `as!` or `fatalError`.
  */
-@property (nonatomic, strong, nullable, readonly) ObjectType object;
+@property (nonatomic, strong, null_unspecified, readonly) ObjectType object;
 
 /**
  Updates the section controller to a new object.
diff --git a/Source/IGListKit/IGListSectionController.h b/Source/IGListKit/IGListSectionController.h
index 68a455f4b..446346ad4 100644
--- a/Source/IGListKit/IGListSectionController.h
+++ b/Source/IGListKit/IGListSectionController.h
@@ -147,8 +147,13 @@ NS_SWIFT_NAME(ListSectionController)
  A context object for interacting with the collection.
 
  Use this property for accessing the collection size, dequeuing cells, reloading, inserting, deleting, etc.
+
+ @note When created outside of `-listAdapter:sectionControllerForObject:`, this object is temporarily `nil`
+ after initialization. We bridge it to Swift as an implicitly-unwrapped Optional, so that idiomatic IGListKit
+ code is not forced to handle nullability with explicit `as!` or `fatalError`, as using a non-`nil` instance
+ of this object is essential for dequeueing cells.
  */
-@property (nonatomic, weak, nullable, readonly) id <IGListCollectionContext> collectionContext;
+@property (nonatomic, weak, null_unspecified, readonly) id <IGListCollectionContext> collectionContext;
 
 /**
  Returns the section within the list for this section controller.