diff --git a/Directory.Packages.props b/Directory.Packages.props
index 7df5626..1c2a254 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -48,12 +48,12 @@
     <PackageVersion Include="Microsoft.VisualStudio.SolutionPersistence" Version="1.0.52" />
     <PackageVersion Include="NuGet.Versioning" Version="7.6.0" />
     <PackageVersion Include="Octokit" Version="14.0.0" />
-    <PackageVersion Include="PolyKit.Embedded" Version="3.0.27-preview" />
     <PackageVersion Include="Spectre.Console" Version="0.57.2" />
   </ItemGroup>
 
   <!-- Development dependencies-->
   <ItemGroup>
+    <PackageVersion Include="PolySharp" Version="1.16.0" />
   </ItemGroup>
 
   <!-- Test dependencies-->
diff --git a/src/Buildvana.Sdk.SourceGenerators/Buildvana.Sdk.SourceGenerators.csproj b/src/Buildvana.Sdk.SourceGenerators/Buildvana.Sdk.SourceGenerators.csproj
index 27d21f7..7e5e6d8 100644
--- a/src/Buildvana.Sdk.SourceGenerators/Buildvana.Sdk.SourceGenerators.csproj
+++ b/src/Buildvana.Sdk.SourceGenerators/Buildvana.Sdk.SourceGenerators.csproj
@@ -4,6 +4,11 @@
     <TargetFramework>$(SourceGeneratorsTfm)</TargetFramework>
     <CLSCompliant>false</CLSCompliant>
     <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
+
+    <!-- Restrict PolySharp to the polyfills this project actually uses; add types here as new needs arise.
+         Mind the polyfills' own dependencies (e.g. System.Index needs the nullable attributes, which would
+         collide with the BCL's in projects that see our internals through InternalsVisibleTo). -->
+    <PolySharpIncludeGeneratedTypes>System.Runtime.CompilerServices.IsExternalInit</PolySharpIncludeGeneratedTypes>
   </PropertyGroup>
 
   <ItemGroup>
@@ -18,7 +23,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.Common" PrivateAssets="all" />
-    <PackageReference Include="PolyKit.Embedded" PrivateAssets="all" />
+    <PackageReference Include="PolySharp" PrivateAssets="all" />
   </ItemGroup>
 
 </Project>
diff --git a/src/Buildvana.Sdk.SourceGenerators/Internal/ConstantValueParser.cs b/src/Buildvana.Sdk.SourceGenerators/Internal/ConstantValueParser.cs
index ef10bb5..6d4f1fe 100644
--- a/src/Buildvana.Sdk.SourceGenerators/Internal/ConstantValueParser.cs
+++ b/src/Buildvana.Sdk.SourceGenerators/Internal/ConstantValueParser.cs
@@ -43,7 +43,7 @@ public static bool TryParse(string? str, out object? result)
             return true;
         }
 
-        if (str!.Length > 1 && str[0] == '"' && str[^1] == '"')
+        if (str!.Length > 1 && str[0] == '"' && str[str.Length - 1] == '"')
         {
             result = str.Substring(1, str.Length - 2).Replace("\"\"", "\"");
             return true;
diff --git a/tests/Buildvana.Sdk.SourceGenerators.Tests/Buildvana.Sdk.SourceGenerators.Tests.csproj b/tests/Buildvana.Sdk.SourceGenerators.Tests/Buildvana.Sdk.SourceGenerators.Tests.csproj
index e1706f7..ef09e82 100644
--- a/tests/Buildvana.Sdk.SourceGenerators.Tests/Buildvana.Sdk.SourceGenerators.Tests.csproj
+++ b/tests/Buildvana.Sdk.SourceGenerators.Tests/Buildvana.Sdk.SourceGenerators.Tests.csproj
@@ -14,9 +14,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <!-- The alias keeps the project's internals (which include PolyKit polyfills, made visible by InternalsVisibleTo)
-         out of the global namespace, where they would clash with the framework's own types. -->
-    <ProjectReference Include="..\..\src\Buildvana.Sdk.SourceGenerators\Buildvana.Sdk.SourceGenerators.csproj" Aliases="Generators" />
+    <ProjectReference Include="..\..\src\Buildvana.Sdk.SourceGenerators\Buildvana.Sdk.SourceGenerators.csproj" />
   </ItemGroup>
 
 </Project>
diff --git a/tests/Buildvana.Sdk.SourceGenerators.Tests/ConstantValueParserTests.cs b/tests/Buildvana.Sdk.SourceGenerators.Tests/ConstantValueParserTests.cs
index 9982c42..00a3d4a 100644
--- a/tests/Buildvana.Sdk.SourceGenerators.Tests/ConstantValueParserTests.cs
+++ b/tests/Buildvana.Sdk.SourceGenerators.Tests/ConstantValueParserTests.cs
@@ -1,9 +1,7 @@
 // Copyright (C) Tenacom and Contributors. Licensed under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-extern alias Generators;
-
-using Generators::Buildvana.Sdk.SourceGenerators.Internal;
+using Buildvana.Sdk.SourceGenerators.Internal;
 
 internal sealed class ConstantValueParserTests
 {
diff --git a/tests/Buildvana.Sdk.SourceGenerators.Tests/ThisAssemblyClassGeneratorTests.cs b/tests/Buildvana.Sdk.SourceGenerators.Tests/ThisAssemblyClassGeneratorTests.cs
index 0003fa4..1d46c11 100644
--- a/tests/Buildvana.Sdk.SourceGenerators.Tests/ThisAssemblyClassGeneratorTests.cs
+++ b/tests/Buildvana.Sdk.SourceGenerators.Tests/ThisAssemblyClassGeneratorTests.cs
@@ -1,10 +1,8 @@
 // Copyright (C) Tenacom and Contributors. Licensed under the MIT license.
 // See the LICENSE file in the project root for full license information.
 
-extern alias Generators;
-
 using System.Globalization;
-using Generators::Buildvana.Sdk.SourceGenerators;
+using Buildvana.Sdk.SourceGenerators;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;