Fix all strong-mode warnings.

CHANGELOG.md

+## 1.1.3
+
+* Fix all strong-mode warnings.
+
 ## 1.1.2
 
 * Fix a bug where `TypedDataBuffer.insertAll` could fail to insert some elements
   of an `Iterable`.
 
 ## 1.1.1
 
 * Optimize `insertAll` with an `Iterable` argument and no end-point.
 
 ## 1.1.0
 
 * Add `start` and `end` parameters to the `addAll()` and `insertAll()` methods
   for the typed data buffer classes. These allow efficient concatenation of
   slices of existing typed data.
 
 * Make `addAll()` for typed data buffer classes more efficient for lists,
   especially typed data lists.
 
 ## 1.0.0
 
 * ChangeLog starts here