diff --git a/src/Reflectify/EmbeddedAttribute.cs b/src/Reflectify/EmbeddedAttribute.cs
new file mode 100644
index 0000000..9fb5f2a
--- /dev/null
+++ b/src/Reflectify/EmbeddedAttribute.cs
@@ -0,0 +1,26 @@
+#if !REFLECTIFY_COMPILE
+// <autogenerated />
+#pragma warning disable
+#endif
+
+#nullable disable
+
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+namespace Microsoft.CodeAnalysis;
+
+/// <summary>
+/// A special attribute recognized by Roslyn, that marks a type as "embedded", meaning it won't ever be visible from
+/// other assemblies.
+/// </summary>
+/// <remarks>
+/// Another source-only package compiled into the same assembly may declare this attribute too. Declaring it as
+/// <c>partial</c> lets both declarations merge into one type instead of colliding. For that to work, no part may
+/// carry a type-level attribute such as <c>[AttributeUsage]</c>, because attributes cannot be repeated across parts.
+/// Leaving it off is harmless: <c>AttributeTargets.All</c> is the default.
+/// </remarks>
+#pragma warning disable RCS1203, MA0010, CA1018 // Deliberately omitted so that duplicate declarations can merge, see above.
+internal sealed partial class EmbeddedAttribute : System.Attribute
+#pragma warning restore RCS1203, MA0010, CA1018
+{
+}
diff --git a/src/Reflectify/MemberInfoExtensions.cs b/src/Reflectify/MemberInfoExtensions.cs
index 36597b0..2f6be08 100644
--- a/src/Reflectify/MemberInfoExtensions.cs
+++ b/src/Reflectify/MemberInfoExtensions.cs
@@ -11,7 +11,13 @@
 
 namespace Reflectify;
 
+#if REFLECTIFY_COMPILE
+public static class MemberInfoExtensions
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal static class MemberInfoExtensions
+#endif
 {
     public static bool HasAttribute<TAttribute>(this MemberInfo member)
         where TAttribute : Attribute
diff --git a/src/Reflectify/MemberKind.cs b/src/Reflectify/MemberKind.cs
index 0580cf8..3c211c7 100644
--- a/src/Reflectify/MemberKind.cs
+++ b/src/Reflectify/MemberKind.cs
@@ -14,7 +14,12 @@ namespace Reflectify;
 /// Defines the kinds of members you want to get when querying for the fields and properties of a type.
 /// </summary>
 [Flags]
+#if REFLECTIFY_COMPILE
+public enum MemberKind
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
 internal enum MemberKind
+#endif
 {
     None,
     Public = 1,
@@ -24,7 +29,13 @@ internal enum MemberKind
     Static = 16
 }
 
+#if REFLECTIFY_COMPILE
+public static class MemberKindExtensions
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal static class MemberKindExtensions
+#endif
 {
     public static BindingFlags ToBindingFlags(this MemberKind kind)
     {
diff --git a/src/Reflectify/ParameterInfoExtensions.cs b/src/Reflectify/ParameterInfoExtensions.cs
index 9e57ddb..3dd82aa 100644
--- a/src/Reflectify/ParameterInfoExtensions.cs
+++ b/src/Reflectify/ParameterInfoExtensions.cs
@@ -11,7 +11,13 @@
 
 namespace Reflectify;
 
+#if REFLECTIFY_COMPILE
+public static class ParameterInfoExtensions
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal static class ParameterInfoExtensions
+#endif
 {
     /// <summary>
     /// Returns <see langword="true" /> if the parameter is decorated with the specific <typeparamref name="TAttribute"/>,
diff --git a/src/Reflectify/PropertyInfoExtensions.cs b/src/Reflectify/PropertyInfoExtensions.cs
index c5e6509..e049f95 100644
--- a/src/Reflectify/PropertyInfoExtensions.cs
+++ b/src/Reflectify/PropertyInfoExtensions.cs
@@ -9,7 +9,13 @@
 
 namespace Reflectify;
 
+#if REFLECTIFY_COMPILE
+public static class PropertyInfoExtensions
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal static class PropertyInfoExtensions
+#endif
 {
     /// <summary>
     /// Returns <see langword="true" /> if the property is an indexer, or <see langword="false" /> otherwise.
diff --git a/src/Reflectify/Reflectify.csproj b/src/Reflectify/Reflectify.csproj
index f5a3e35..1a674e5 100644
--- a/src/Reflectify/Reflectify.csproj
+++ b/src/Reflectify/Reflectify.csproj
@@ -8,14 +8,9 @@
         <NuSpecFile>.nuspec</NuSpecFile>
         <NuspecProperties>version=$(Version)</NuspecProperties>
         <DefineConstants>REFLECTIFY_COMPILE</DefineConstants>
+        <NoWarn>1591;1573</NoWarn>
     </PropertyGroup>
 
-  <ItemGroup Label="Internals visible to">
-    <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleToAttribute">
-      <_Parameter1>Reflectify.Specs</_Parameter1>
-    </AssemblyAttribute>
-  </ItemGroup>
-
   <PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
       <DocumentationFile>bin\Debug\Reflectify.xml</DocumentationFile>
     </PropertyGroup>
diff --git a/src/Reflectify/Reflector.cs b/src/Reflectify/Reflector.cs
index 96df0d2..cb2ad2b 100644
--- a/src/Reflectify/Reflector.cs
+++ b/src/Reflectify/Reflector.cs
@@ -15,7 +15,13 @@ namespace Reflectify;
 /// <summary>
 /// Helper class to get all the public and internal fields and properties from a type.
 /// </summary>
+#if REFLECTIFY_COMPILE
+public sealed class Reflector(Type typeToReflect, MemberKind kind)
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal sealed class Reflector(Type typeToReflect, MemberKind kind)
+#endif
 {
     private readonly object lazyLoadingLock = new();
     private volatile PropertyInfo[] cachedProperties;
@@ -173,7 +179,7 @@ private static bool HasVisibility(MemberKind kind, FieldInfo field)
                ((kind & MemberKind.Internal) != MemberKind.None && (field.IsAssembly || field.IsFamilyOrAssembly));
     }
 
-    private class OrderedPropertyCollection
+    private sealed class OrderedPropertyCollection
     {
         private readonly Dictionary<string, PropertyKind> kindMap = new();
         private readonly List<(string Name, PropertyInfo Property)> propertiesWithName = new();
diff --git a/src/Reflectify/TypeExtensions.cs b/src/Reflectify/TypeExtensions.cs
index ddfc792..d18d316 100644
--- a/src/Reflectify/TypeExtensions.cs
+++ b/src/Reflectify/TypeExtensions.cs
@@ -9,7 +9,13 @@
 
 namespace Reflectify;
 
+#if REFLECTIFY_COMPILE
+public static class TypeExtensions
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal static class TypeExtensions
+#endif
 {
     /// <summary>
     /// If the type provided is a nullable type, gets the underlying type. Returns the type itself otherwise.
diff --git a/src/Reflectify/TypeMemberExtensions.cs b/src/Reflectify/TypeMemberExtensions.cs
index 86b98a9..af8941f 100644
--- a/src/Reflectify/TypeMemberExtensions.cs
+++ b/src/Reflectify/TypeMemberExtensions.cs
@@ -13,7 +13,13 @@
 
 namespace Reflectify;
 
+#if REFLECTIFY_COMPILE
+public static class TypeMemberExtensions
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal static class TypeMemberExtensions
+#endif
 {
     private static readonly ConcurrentDictionary<(Type Type, MemberKind Kind), Reflector> ReflectorCache = new();
 
diff --git a/src/Reflectify/TypeMetaDataExtensions.cs b/src/Reflectify/TypeMetaDataExtensions.cs
index 4c5d4f2..d4062e1 100644
--- a/src/Reflectify/TypeMetaDataExtensions.cs
+++ b/src/Reflectify/TypeMetaDataExtensions.cs
@@ -14,7 +14,13 @@
 
 namespace Reflectify;
 
+#if REFLECTIFY_COMPILE
+public static class TypeMetaDataExtensions
+#else
+[global::Microsoft.CodeAnalysis.Embedded]
+[global::System.Diagnostics.DebuggerNonUserCode]
 internal static class TypeMetaDataExtensions
+#endif
 {
     /// <summary>
     /// Returns the name of the type without the generic backtick and the type arguments.