diff --git a/packages/pigeon/pigeons/core_tests.dart b/packages/pigeon/pigeons/core_tests.dart
index 0aa5cba..730eabc 100644
--- a/packages/pigeon/pigeons/core_tests.dart
+++ b/packages/pigeon/pigeons/core_tests.dart
@@ -4,6 +4,12 @@
 
 import 'package:pigeon/pigeon.dart';
 
+enum AnEnum {
+  one,
+  two,
+  three,
+}
+
 // A class containing all supported types.
 class AllTypes {
   bool? aBool;
@@ -21,6 +27,7 @@
   List<List<bool?>?>? nestedList;
   Map<String?, String?>? mapWithAnnotations;
   Map<String?, Object?>? mapWithObject;
+  AnEnum? anEnum;
 }
 
 // A class for testing nested object handling.
@@ -64,10 +71,22 @@
   @ObjCSelector('echoInt:')
   int echoInt(int anInt);
 
-  /// Returns the passed in boolean asynchronously.
+  /// Returns passed in double.
+  @ObjCSelector('echoDouble:')
+  double echoDouble(double aDouble);
+
+  /// Returns the passed in boolean.
   @ObjCSelector('echoBool:')
   bool echoBool(bool aBool);
 
+  /// Returns the passed in string.
+  @ObjCSelector('echoString:')
+  String echoString(String aString);
+
+  /// Returns the passed in Uint8List.
+  @ObjCSelector('echoUint8List:')
+  Uint8List echoUint8List(Uint8List aUint8List);
+
   // ========== Asyncronous method tests ==========
 
   /// A no-op function taking no arguments and returning no value, to sanity
diff --git a/packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/main/java/com/example/alternate_language_test_plugin/AlternateLanguageTestPlugin.java b/packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/main/java/com/example/alternate_language_test_plugin/AlternateLanguageTestPlugin.java
index bfc0e56..838db53 100644
--- a/packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/main/java/com/example/alternate_language_test_plugin/AlternateLanguageTestPlugin.java
+++ b/packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/main/java/com/example/alternate_language_test_plugin/AlternateLanguageTestPlugin.java
@@ -66,11 +66,26 @@
   }
 
   @Override
+  public Double echoDouble(@NonNull Double aDouble) {
+    return aDouble;
+  }
+
+  @Override
   public Boolean echoBool(@NonNull Boolean aBool) {
     return aBool;
   }
 
   @Override
+  public String echoString(@NonNull String aString) {
+    return aString;
+  }
+
+  @Override
+  public byte[] echoUint8List(@NonNull byte[] aUint8List) {
+    return aUint8List;
+  }
+
+  @Override
   public void noopAsync(Result<Void> result) {
     result.success(null);
   }
diff --git a/packages/pigeon/platform_tests/alternate_language_test_plugin/ios/Classes/AlternateLanguageTestPlugin.m b/packages/pigeon/platform_tests/alternate_language_test_plugin/ios/Classes/AlternateLanguageTestPlugin.m
index 8f8a62e..cbe1bda 100644
--- a/packages/pigeon/platform_tests/alternate_language_test_plugin/ios/Classes/AlternateLanguageTestPlugin.m
+++ b/packages/pigeon/platform_tests/alternate_language_test_plugin/ios/Classes/AlternateLanguageTestPlugin.m
@@ -63,10 +63,25 @@
   return anInt;
 }
 
+- (nullable NSNumber *)echoDouble:(NSNumber *)aDouble
+                            error:(FlutterError *_Nullable *_Nonnull)error {
+  return aDouble
+}
+
 - (nullable NSNumber *)echoBool:(NSNumber *)aBool error:(FlutterError *_Nullable *_Nonnull)error {
   return aBool;
 }
 
+- (nullable NSString *)echoString:(NSString *)aString
+                            error:(FlutterError *_Nullable *_Nonnull)error {
+  return aString;
+}
+
+- (nullable FlutterStandardTypedData *)echoUint8List:(FlutterStandardTypedData *)aUint8List
+                                               error:(FlutterError *_Nullable *_Nonnull)error {
+  return aUint8List;
+}
+
 - (void)noopAsyncWithCompletion:(void (^)(FlutterError *_Nullable))completion {
   completion(nil);
 }
diff --git a/packages/pigeon/platform_tests/flutter_null_safe_unit_tests/lib/core_tests.gen.dart b/packages/pigeon/platform_tests/flutter_null_safe_unit_tests/lib/core_tests.gen.dart
index 7f7a4d3..b701c66 100644
--- a/packages/pigeon/platform_tests/flutter_null_safe_unit_tests/lib/core_tests.gen.dart
+++ b/packages/pigeon/platform_tests/flutter_null_safe_unit_tests/lib/core_tests.gen.dart
@@ -11,6 +11,12 @@
 import 'package:flutter/foundation.dart' show ReadBuffer, WriteBuffer;
 import 'package:flutter/services.dart';
 
+enum AnEnum {
+  one,
+  two,
+  three,
+}
+
 class AllTypes {
   AllTypes({
     this.aBool,
@@ -26,6 +32,7 @@
     this.nestedList,
     this.mapWithAnnotations,
     this.mapWithObject,
+    this.anEnum,
   });
 
   bool? aBool;
@@ -41,6 +48,7 @@
   List<List<bool?>?>? nestedList;
   Map<String?, String?>? mapWithAnnotations;
   Map<String?, Object?>? mapWithObject;
+  AnEnum? anEnum;
 
   Object encode() {
     final Map<Object?, Object?> pigeonMap = <Object?, Object?>{};
@@ -57,6 +65,7 @@
     pigeonMap['nestedList'] = nestedList;
     pigeonMap['mapWithAnnotations'] = mapWithAnnotations;
     pigeonMap['mapWithObject'] = mapWithObject;
+    pigeonMap['anEnum'] = anEnum?.index;
     return pigeonMap;
   }
 
@@ -80,6 +89,9 @@
               ?.cast<String?, String?>(),
       mapWithObject: (pigeonMap['mapWithObject'] as Map<Object?, Object?>?)
           ?.cast<String?, Object?>(),
+      anEnum: pigeonMap['anEnum'] != null
+          ? AnEnum.values[pigeonMap['anEnum']! as int]
+          : null,
     );
   }
 }
@@ -347,7 +359,37 @@
     }
   }
 
-  /// Returns the passed in boolean asynchronously.
+  /// Returns passed in double.
+  Future<double> echoDouble(double arg_aDouble) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.HostIntegrationCoreApi.echoDouble', codec,
+        binaryMessenger: _binaryMessenger);
+    final Map<Object?, Object?>? replyMap =
+        await channel.send(<Object?>[arg_aDouble]) as Map<Object?, Object?>?;
+    if (replyMap == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyMap['error'] != null) {
+      final Map<Object?, Object?> error =
+          (replyMap['error'] as Map<Object?, Object?>?)!;
+      throw PlatformException(
+        code: (error['code'] as String?)!,
+        message: error['message'] as String?,
+        details: error['details'],
+      );
+    } else if (replyMap['result'] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyMap['result'] as double?)!;
+    }
+  }
+
+  /// Returns the passed in boolean.
   Future<bool> echoBool(bool arg_aBool) async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
         'dev.flutter.pigeon.HostIntegrationCoreApi.echoBool', codec,
@@ -377,6 +419,66 @@
     }
   }
 
+  /// Returns the passed in string.
+  Future<String> echoString(String arg_aString) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.HostIntegrationCoreApi.echoString', codec,
+        binaryMessenger: _binaryMessenger);
+    final Map<Object?, Object?>? replyMap =
+        await channel.send(<Object?>[arg_aString]) as Map<Object?, Object?>?;
+    if (replyMap == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyMap['error'] != null) {
+      final Map<Object?, Object?> error =
+          (replyMap['error'] as Map<Object?, Object?>?)!;
+      throw PlatformException(
+        code: (error['code'] as String?)!,
+        message: error['message'] as String?,
+        details: error['details'],
+      );
+    } else if (replyMap['result'] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyMap['result'] as String?)!;
+    }
+  }
+
+  /// Returns the passed in Uint8List.
+  Future<Uint8List> echoUint8List(Uint8List arg_aUint8List) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.HostIntegrationCoreApi.echoUint8List', codec,
+        binaryMessenger: _binaryMessenger);
+    final Map<Object?, Object?>? replyMap =
+        await channel.send(<Object?>[arg_aUint8List]) as Map<Object?, Object?>?;
+    if (replyMap == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyMap['error'] != null) {
+      final Map<Object?, Object?> error =
+          (replyMap['error'] as Map<Object?, Object?>?)!;
+      throw PlatformException(
+        code: (error['code'] as String?)!,
+        message: error['message'] as String?,
+        details: error['details'],
+      );
+    } else if (replyMap['result'] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyMap['result'] as Uint8List?)!;
+    }
+  }
+
   /// A no-op function taking no arguments and returning no value, to sanity
   /// test basic asynchronous calling.
   Future<void> noopAsync() async {
diff --git a/packages/pigeon/platform_tests/shared_test_plugin_code/lib/integration_tests.dart b/packages/pigeon/platform_tests/shared_test_plugin_code/lib/integration_tests.dart
index fcd2e61..4e68c3a 100644
--- a/packages/pigeon/platform_tests/shared_test_plugin_code/lib/integration_tests.dart
+++ b/packages/pigeon/platform_tests/shared_test_plugin_code/lib/integration_tests.dart
@@ -61,6 +61,7 @@
           <bool>[true, false],
           <bool>[false, true]
         ],
+        anEnum: AnEnum.two,
       );
 
       final AllTypes echoObject = await api.echoAllTypes(sentObject);
@@ -90,6 +91,7 @@
           true);
       expect(
           mapEquals(echoObject.mapWithObject, sentObject.mapWithObject), true);
+      expect(echoObject.anEnum, sentObject.anEnum);
     });
 
     testWidgets('errors are returned correctly', (WidgetTester _) async {
@@ -143,9 +145,18 @@
         (WidgetTester _) async {
       final HostIntegrationCoreApi api = HostIntegrationCoreApi();
 
-      const int inInt = -13;
-      final int anInt = await api.echoInt(inInt);
-      expect(anInt, inInt);
+      const int sentInt = -13;
+      final int receivedInt = await api.echoInt(sentInt);
+      expect(receivedInt, sentInt);
+    });
+
+    testWidgets('Doubles serialize and deserialize correctly',
+        (WidgetTester _) async {
+      final HostIntegrationCoreApi api = HostIntegrationCoreApi();
+
+      const double sentDouble = 2.0694;
+      final double receivedDouble = await api.echoDouble(sentDouble);
+      expect(receivedDouble, sentDouble);
     });
 
     testWidgets('booleans serialize and deserialize correctly',
@@ -157,6 +168,28 @@
         expect(receivedBool, sentBool);
       }
     });
+
+    testWidgets('strings serialize and deserialize correctly',
+        (WidgetTester _) async {
+      final HostIntegrationCoreApi api = HostIntegrationCoreApi();
+      const String sentString = "I'm a computer";
+      final String receivedString = await api.echoString(sentString);
+      expect(receivedString, sentString);
+    });
+
+    // TODO(stuartmorgan): Enable these once they work for all generators;
+    // currently at least Swift is broken.
+    // TODO(tarrinneal): Finish tests for int lists once issue solved.
+    // See https://github.com/flutter/flutter/issues/115906
+    // testWidgets('Uint8List serialize and deserialize correctly',
+    //     (WidgetTester _) async {
+    //   final HostIntegrationCoreApi api = HostIntegrationCoreApi();
+    //   final List<int> data = [102, 111, 114, 116, 121, 45, 116, 119, 111, 0];
+    //   final Uint8List sentUint8List = Uint8List.fromList(data);
+    //   final Uint8List receivedUint8List =
+    //       await api.echoUint8List(sentUint8List);
+    //   expect(receivedUint8List, sentUint8List);
+    // });
   });
 
   group('Host async API tests', () {
diff --git a/packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/core_tests.gen.dart b/packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/core_tests.gen.dart
index 7f7a4d3..b701c66 100644
--- a/packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/core_tests.gen.dart
+++ b/packages/pigeon/platform_tests/shared_test_plugin_code/lib/src/generated/core_tests.gen.dart
@@ -11,6 +11,12 @@
 import 'package:flutter/foundation.dart' show ReadBuffer, WriteBuffer;
 import 'package:flutter/services.dart';
 
+enum AnEnum {
+  one,
+  two,
+  three,
+}
+
 class AllTypes {
   AllTypes({
     this.aBool,
@@ -26,6 +32,7 @@
     this.nestedList,
     this.mapWithAnnotations,
     this.mapWithObject,
+    this.anEnum,
   });
 
   bool? aBool;
@@ -41,6 +48,7 @@
   List<List<bool?>?>? nestedList;
   Map<String?, String?>? mapWithAnnotations;
   Map<String?, Object?>? mapWithObject;
+  AnEnum? anEnum;
 
   Object encode() {
     final Map<Object?, Object?> pigeonMap = <Object?, Object?>{};
@@ -57,6 +65,7 @@
     pigeonMap['nestedList'] = nestedList;
     pigeonMap['mapWithAnnotations'] = mapWithAnnotations;
     pigeonMap['mapWithObject'] = mapWithObject;
+    pigeonMap['anEnum'] = anEnum?.index;
     return pigeonMap;
   }
 
@@ -80,6 +89,9 @@
               ?.cast<String?, String?>(),
       mapWithObject: (pigeonMap['mapWithObject'] as Map<Object?, Object?>?)
           ?.cast<String?, Object?>(),
+      anEnum: pigeonMap['anEnum'] != null
+          ? AnEnum.values[pigeonMap['anEnum']! as int]
+          : null,
     );
   }
 }
@@ -347,7 +359,37 @@
     }
   }
 
-  /// Returns the passed in boolean asynchronously.
+  /// Returns passed in double.
+  Future<double> echoDouble(double arg_aDouble) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.HostIntegrationCoreApi.echoDouble', codec,
+        binaryMessenger: _binaryMessenger);
+    final Map<Object?, Object?>? replyMap =
+        await channel.send(<Object?>[arg_aDouble]) as Map<Object?, Object?>?;
+    if (replyMap == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyMap['error'] != null) {
+      final Map<Object?, Object?> error =
+          (replyMap['error'] as Map<Object?, Object?>?)!;
+      throw PlatformException(
+        code: (error['code'] as String?)!,
+        message: error['message'] as String?,
+        details: error['details'],
+      );
+    } else if (replyMap['result'] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyMap['result'] as double?)!;
+    }
+  }
+
+  /// Returns the passed in boolean.
   Future<bool> echoBool(bool arg_aBool) async {
     final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
         'dev.flutter.pigeon.HostIntegrationCoreApi.echoBool', codec,
@@ -377,6 +419,66 @@
     }
   }
 
+  /// Returns the passed in string.
+  Future<String> echoString(String arg_aString) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.HostIntegrationCoreApi.echoString', codec,
+        binaryMessenger: _binaryMessenger);
+    final Map<Object?, Object?>? replyMap =
+        await channel.send(<Object?>[arg_aString]) as Map<Object?, Object?>?;
+    if (replyMap == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyMap['error'] != null) {
+      final Map<Object?, Object?> error =
+          (replyMap['error'] as Map<Object?, Object?>?)!;
+      throw PlatformException(
+        code: (error['code'] as String?)!,
+        message: error['message'] as String?,
+        details: error['details'],
+      );
+    } else if (replyMap['result'] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyMap['result'] as String?)!;
+    }
+  }
+
+  /// Returns the passed in Uint8List.
+  Future<Uint8List> echoUint8List(Uint8List arg_aUint8List) async {
+    final BasicMessageChannel<Object?> channel = BasicMessageChannel<Object?>(
+        'dev.flutter.pigeon.HostIntegrationCoreApi.echoUint8List', codec,
+        binaryMessenger: _binaryMessenger);
+    final Map<Object?, Object?>? replyMap =
+        await channel.send(<Object?>[arg_aUint8List]) as Map<Object?, Object?>?;
+    if (replyMap == null) {
+      throw PlatformException(
+        code: 'channel-error',
+        message: 'Unable to establish connection on channel.',
+      );
+    } else if (replyMap['error'] != null) {
+      final Map<Object?, Object?> error =
+          (replyMap['error'] as Map<Object?, Object?>?)!;
+      throw PlatformException(
+        code: (error['code'] as String?)!,
+        message: error['message'] as String?,
+        details: error['details'],
+      );
+    } else if (replyMap['result'] == null) {
+      throw PlatformException(
+        code: 'null-error',
+        message: 'Host platform returned null value for non-null return value.',
+      );
+    } else {
+      return (replyMap['result'] as Uint8List?)!;
+    }
+  }
+
   /// A no-op function taking no arguments and returning no value, to sanity
   /// test basic asynchronous calling.
   Future<void> noopAsync() async {
diff --git a/packages/pigeon/platform_tests/test_plugin/android/src/main/kotlin/com/example/test_plugin/TestPlugin.kt b/packages/pigeon/platform_tests/test_plugin/android/src/main/kotlin/com/example/test_plugin/TestPlugin.kt
index 73d9a71..2b8843b 100644
--- a/packages/pigeon/platform_tests/test_plugin/android/src/main/kotlin/com/example/test_plugin/TestPlugin.kt
+++ b/packages/pigeon/platform_tests/test_plugin/android/src/main/kotlin/com/example/test_plugin/TestPlugin.kt
@@ -57,10 +57,22 @@
     return anInt
   }
 
+  override fun echoDouble(aDouble: Double): Double {
+    return aDouble
+  }
+
   override fun echoBool(aBool: Boolean): Boolean {
     return aBool
   }
 
+  override fun echoString(aString: String): String {
+    return aString
+  }
+
+  override fun echoUint8List(aUint8List: ByteArray): ByteArray {
+    return aUint8List
+  }
+
   override fun noopAsync(callback: () -> Unit) {
     callback()
   }
diff --git a/packages/pigeon/platform_tests/test_plugin/ios/Classes/TestPlugin.swift b/packages/pigeon/platform_tests/test_plugin/ios/Classes/TestPlugin.swift
index 441d980..b27bbb2 100644
--- a/packages/pigeon/platform_tests/test_plugin/ios/Classes/TestPlugin.swift
+++ b/packages/pigeon/platform_tests/test_plugin/ios/Classes/TestPlugin.swift
@@ -52,10 +52,22 @@
     return anInt
   }
 
+  func echoDouble(aDouble: Double) -> Double {
+    return aDouble
+  }
+
   func echoBool(aBool: Bool) -> Bool {
     return aBool
   }
 
+  func echoString(aString: String) -> String {
+    return aString
+  }
+
+  func echoUint8List(aUint8List: [UInt8]) -> [UInt8] {
+    return aUint8List
+  }
+
   func noopAsync(completion: @escaping () -> Void) {
     completion()
   }
diff --git a/packages/pigeon/platform_tests/test_plugin/macos/Classes/TestPlugin.swift b/packages/pigeon/platform_tests/test_plugin/macos/Classes/TestPlugin.swift
index 2b22866..be3d518 100644
--- a/packages/pigeon/platform_tests/test_plugin/macos/Classes/TestPlugin.swift
+++ b/packages/pigeon/platform_tests/test_plugin/macos/Classes/TestPlugin.swift
@@ -52,10 +52,22 @@
     return anInt
   }
 
+  func echoDouble(aDouble: Double) -> Double {
+    return aDouble
+  }
+
   func echoBool(aBool: Bool) -> Bool {
     return aBool
   }
 
+  func echoString(aString: String) -> String {
+    return aString
+  }
+
+  func echoUint8List(aUint8List: [UInt8]) -> [UInt8] {
+    return aUint8List
+  }
+
   func noopAsync(completion: @escaping () -> Void) {
     completion()
   }
diff --git a/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.cpp b/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.cpp
index e6a4221..6e1a25c 100644
--- a/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.cpp
+++ b/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.cpp
@@ -76,8 +76,18 @@
 
 ErrorOr<int64_t> TestPlugin::EchoInt(int64_t an_int) { return an_int; }
 
+ErrorOr<double> TestPlugin::EchoDouble(double a_double) { return a_double; }
+
 ErrorOr<bool> TestPlugin::EchoBool(bool a_bool) { return a_bool; }
 
+ErrorOr<std::string> TestPlugin::EchoString(const std::string& a_string) {
+  return a_string;
+}
+
+ErrorOr<std::vector<uint8_t>> TestPlugin::EchoUint8List(
+    const std::vector<uint8_t>& a_uint8_list) {
+  return a_uint8_list;
+}
 void TestPlugin::NoopAsync(
     std::function<void(std::optional<FlutterError> reply)> result) {
   result(std::nullopt);
diff --git a/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.h b/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.h
index 4c4bfac..20b6d50 100644
--- a/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.h
+++ b/packages/pigeon/platform_tests/test_plugin/windows/test_plugin.h
@@ -45,7 +45,12 @@
   SendMultipleTypes(bool a_bool, int64_t an_int,
                     const std::string& a_string) override;
   core_tests_pigeontest::ErrorOr<int64_t> EchoInt(int64_t an_int) override;
+  core_tests_pigeontest::ErrorOr<double> EchoDouble(double a_double) override;
   core_tests_pigeontest::ErrorOr<bool> EchoBool(bool a_bool) override;
+  core_tests_pigeontest::ErrorOr<std::string> EchoString(
+      const std::string& a_string) override;
+  core_tests_pigeontest::ErrorOr<std::vector<uint8_t>> EchoUint8List(
+      const std::vector<uint8_t>& a_uint8_list) override;
   void NoopAsync(std::function<
                  void(std::optional<core_tests_pigeontest::FlutterError> reply)>
                      result) override;