Use whereType() instead of chaining where() and cast().

angel_serialize_generator/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 2.5.0
+* Support mutable models (again).
+* Use `whereType()` instead of chaining `where()` and `cast()`.
+
 # 2.4.4
 * Remove unnecessary `new` and `const`.
 

angel_serialize_generator/lib/serialize.dart

@@ -282,8 +282,7 @@ class ${pascal}Decoder extends Converter<Map, ${pascal}> {
             var rc = ReCase(type.typeArguments[0].name);
             deserializedRepresentation = "map['$alias'] is Iterable"
                 " ? List.unmodifiable(((map['$alias'] as Iterable)"
-                ".where((x) => x is Map))"
+                ".whereType<Map>())"
-                ".cast<Map>()"
                 ".map(${rc.pascalCase}Serializer.fromMap))"
                 " : $defaultValue";
           } else if (isMapToModelType(type)) {

angel_serialize_generator/test/models/book.g.dart

@@ -479,9 +479,7 @@ class AuthorSerializer extends Codec<Author, Map> {
         name: map['name'] as String,
         age: map['age'] as int,
         books: map['books'] is Iterable
-            ? List.unmodifiable(
+            ? List.unmodifiable(((map['books'] as Iterable).whereType<Map>())
-                ((map['books'] as Iterable).where((x) => x is Map))
-                    .cast<Map>()
                 .map(BookSerializer.fromMap))
             : null,
         newestBook: map['newest_book'] != null

angel_serialize_generator/test/models/game_pad_button.g.dart

@@ -160,9 +160,7 @@ class GamepadSerializer extends Codec<Gamepad, Map> {
   static Gamepad fromMap(Map map) {
     return Gamepad(
         buttons: map['buttons'] is Iterable
-            ? List.unmodifiable(
+            ? List.unmodifiable(((map['buttons'] as Iterable).whereType<Map>())
-                ((map['buttons'] as Iterable).where((x) => x is Map))
-                    .cast<Map>()
                 .map(GamepadButtonSerializer.fromMap))
             : null,
         dynamicMap: map['dynamic_map'] is Map