diff --git a/lib/src/list_range.dart b/lib/src/list_range.dart
index 7889796..2f3b34d 100644
--- a/lib/src/list_range.dart
+++ b/lib/src/list_range.dart
@@ -48,9 +48,9 @@
   bool moveNext();
   int get current;
   int get position;
-  void backup([by]);
+  void backup([int by]);
   int get remaining;
-  void skip([count]);
+  void skip([int count]);
 }
 
 class _ListRangeIteratorImpl implements ListRangeIterator {
diff --git a/lib/src/utf/utf_stream.dart b/lib/src/utf/utf_stream.dart
index 2b460d0..0936616 100644
--- a/lib/src/utf/utf_stream.dart
+++ b/lib/src/utf/utf_stream.dart
@@ -78,7 +78,7 @@
     }
   }
 
-  void addError(Object error, [StackTrace stackTrace]) {
+  void addError(error, [StackTrace stackTrace]) {
     _outSink.addError(error, stackTrace);
   }
 
@@ -189,7 +189,7 @@
     _outSink.add(_processString(data));
   }
 
-  void addError(Object error, [StackTrace stackTrace]) {
+  void addError(error, [StackTrace stackTrace]) {
     _outSink.addError(error, stackTrace);
   }
 
@@ -203,7 +203,7 @@
  */
 class Utf8EncoderTransformer extends _StringEncoder {
   List<int> _processString(String string) {
-    var bytes = [];
+    var bytes = <int>[];
     int pos = 0;
     List<int> codepoints = utf16CodeUnitsToCodepoints(string.codeUnits);
     int length = codepoints.length;
diff --git a/pubspec.yaml b/pubspec.yaml
index a3fd334..519bed4 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: utf
-version: 0.9.0+1
+version: 0.9.0+2
 author: Dart Team <misc@dartlang.org>
 description: >
  A Unicode library. Intended for advanced use where the built-in facilities