Fix a number of hints and lints (dart-lang/yaml_edit#151)

pkgs/yaml_edit/lib/src/equality.dart

diff --git a/pkgs/yaml_edit/lib/src/equality.dart b/pkgs/yaml_edit/lib/src/equality.dart
index 695a775..36b118e 100644
--- a/pkgs/yaml_edit/lib/src/equality.dart
+++ b/pkgs/yaml_edit/lib/src/equality.dart
@@ -44,8 +44,8 @@
 bool listDeepEquals(List list1, List list2) {
   if (list1.length != list2.length) return false;
 
-  if (list1 is YamlList) list1 = (list1 as YamlList).nodes;
-  if (list2 is YamlList) list2 = (list2 as YamlList).nodes;
+  if (list1 is YamlList) list1 = list1.nodes;
+  if (list2 is YamlList) list2 = list2.nodes;
 
   for (var i = 0; i < list1.length; i++) {
     if (!deepEquals(list1[i], list2[i])) {

pkgs/yaml_edit/test/random_test.dart

diff --git a/pkgs/yaml_edit/test/random_test.dart b/pkgs/yaml_edit/test/random_test.dart
index 2b5af99..f867fe6 100644
--- a/pkgs/yaml_edit/test/random_test.dart
+++ b/pkgs/yaml_edit/test/random_test.dart
@@ -253,9 +253,9 @@
 $path
 
 Error Details:
-${error}
+$error
 
-${stacktrace}
+$stacktrace
 ''');
       rethrow;
     }

pkgs/yaml_edit/test/test_case.dart

diff --git a/pkgs/yaml_edit/test/test_case.dart b/pkgs/yaml_edit/test/test_case.dart
index aa80d9e..8db7dbc 100644
--- a/pkgs/yaml_edit/test/test_case.dart
+++ b/pkgs/yaml_edit/test/test_case.dart
@@ -232,10 +232,6 @@
   return node.value;
 }
 
-List<T> _onlyType<T>(List<dynamic> rawPath) {
-  return rawPath.whereType<T>().toList();
-}
-
 /// Converts the list of modifications from the raw input to [_YamlModification]
 /// objects.
 List<_YamlModification> _parseModifications(List<dynamic> modifications) {

pkgs/yaml_edit/test/wrap_test.dart

diff --git a/pkgs/yaml_edit/test/wrap_test.dart b/pkgs/yaml_edit/test/wrap_test.dart
index 6d2b24e..d607ed0 100644
--- a/pkgs/yaml_edit/test/wrap_test.dart
+++ b/pkgs/yaml_edit/test/wrap_test.dart
@@ -101,8 +101,8 @@
             'value'
           ]));
       expect((list as YamlList).style, equals(CollectionStyle.ANY));
-      expect((list as YamlList)[0].style, equals(CollectionStyle.ANY));
-      expect((list as YamlList)[1].style, equals(CollectionStyle.ANY));
+      expect(list[0].style, equals(CollectionStyle.ANY));
+      expect(list[1].style, equals(CollectionStyle.ANY));
     });
 
     test('wraps lists with collectionStyle', () {
@@ -116,8 +116,8 @@
       ], collectionStyle: CollectionStyle.BLOCK);
 
       expect((list as YamlList).style, equals(CollectionStyle.BLOCK));
-      expect((list as YamlList)[0].style, equals(CollectionStyle.ANY));
-      expect((list as YamlList)[1].style, equals(CollectionStyle.ANY));
+      expect(list[0].style, equals(CollectionStyle.ANY));
+      expect(list[1].style, equals(CollectionStyle.ANY));
     });
 
     test('wraps nested lists while preserving style', () {
@@ -131,8 +131,8 @@
       ], collectionStyle: CollectionStyle.BLOCK);
 
       expect((list as YamlList).style, equals(CollectionStyle.BLOCK));
-      expect((list as YamlList)[0].style, equals(CollectionStyle.FLOW));
-      expect((list as YamlList)[1].style, equals(CollectionStyle.FLOW));
+      expect(list[0].style, equals(CollectionStyle.FLOW));
+      expect(list[1].style, equals(CollectionStyle.FLOW));
     });
 
     test('wraps maps', () {
@@ -184,8 +184,8 @@
       }, collectionStyle: CollectionStyle.BLOCK);
 
       expect((map as YamlMap).style, equals(CollectionStyle.BLOCK));
-      expect((map as YamlMap)['list'].style, equals(CollectionStyle.FLOW));
-      expect((map as YamlMap)['map'].style, equals(CollectionStyle.BLOCK));
+      expect(map['list'].style, equals(CollectionStyle.FLOW));
+      expect(map['map'].style, equals(CollectionStyle.BLOCK));
     });
 
     test('works with YamlMap.wrap', () {
@@ -199,8 +199,8 @@
       }, collectionStyle: CollectionStyle.BLOCK);
 
       expect((map as YamlMap).style, equals(CollectionStyle.BLOCK));
-      expect((map as YamlMap)['list'].style, equals(CollectionStyle.FLOW));
-      expect((map as YamlMap)['map'].style, equals(CollectionStyle.ANY));
+      expect(map['list'].style, equals(CollectionStyle.FLOW));
+      expect(map['map'].style, equals(CollectionStyle.ANY));
     });
   });