diff --git a/plist-cil.test/BinaryPropertyListWriterTests.cs b/plist-cil.test/BinaryPropertyListWriterTests.cs
index 8b966aa..3433949 100644
--- a/plist-cil.test/BinaryPropertyListWriterTests.cs
+++ b/plist-cil.test/BinaryPropertyListWriterTests.cs
@@ -21,5 +21,21 @@ namespace plistcil.test
                 writer.Write(root);
             }
         }
+
+        [Fact]
+        public void Roundtrip2Test()
+        {
+            byte[] data = File.ReadAllBytes("test-files/plist2.bin");
+            NSObject root = PropertyListParser.Parse(data);
+
+            using (MemoryStream actualOutput = new MemoryStream())
+            using (Stream expectedOutput = File.OpenRead("test-files/plist2.bin"))
+            using (ValidatingStream validatingStream = new ValidatingStream(actualOutput, expectedOutput))
+            {
+                BinaryPropertyListWriter writer = new BinaryPropertyListWriter(validatingStream);
+                writer.ReuseObjectIds = false;
+                writer.Write(root);
+            }
+        }
     }
 }
diff --git a/plist-cil.test/plist-cil.test.csproj b/plist-cil.test/plist-cil.test.csproj
index 60093e4..c7698c2 100644
--- a/plist-cil.test/plist-cil.test.csproj
+++ b/plist-cil.test/plist-cil.test.csproj
@@ -116,6 +116,9 @@
   </ItemGroup>
 
   <ItemGroup>
+    <None Update="test-files\plist2.bin">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
     <None Update="test-files\RoundtripBinaryIndentation.plist">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
diff --git a/plist-cil.test/test-files/plist2.bin b/plist-cil.test/test-files/plist2.bin
new file mode 100644
index 0000000..cae641d
Binary files /dev/null and b/plist-cil.test/test-files/plist2.bin differ
diff --git a/plist-cil/BinaryPropertyListWriter.GetObjectEqualityComparer.cs b/plist-cil/BinaryPropertyListWriter.GetObjectEqualityComparer.cs
index afc7323..9f3eb54 100644
--- a/plist-cil/BinaryPropertyListWriter.GetObjectEqualityComparer.cs
+++ b/plist-cil/BinaryPropertyListWriter.GetObjectEqualityComparer.cs
@@ -25,6 +25,10 @@ namespace Claunia.PropertyList
                 {
                     return x.Equals(y);
                 }
+                else if (x is NSNumber && BinaryPropertyListWriter.IsSerializationPrimitive((NSNumber)x))
+                {
+                    return x.Equals(y);
+                }
                 else if (x is NSString && BinaryPropertyListWriter.IsSerializationPrimitive((NSString)x))
                 {
                     return x.Equals(y);
@@ -48,6 +52,12 @@ namespace Claunia.PropertyList
                     return u.GetHashCode();
                 }
 
+                var n = obj as NSNumber;
+                if (n != null && BinaryPropertyListWriter.IsSerializationPrimitive(n))
+                {
+                    return n.ToObject().GetHashCode();
+                }
+
                 var s = obj as NSString;
                 if (s != null && BinaryPropertyListWriter.IsSerializationPrimitive(s))
                 {
diff --git a/plist-cil/BinaryPropertyListWriter.cs b/plist-cil/BinaryPropertyListWriter.cs
index 919f921..1c7641d 100644
--- a/plist-cil/BinaryPropertyListWriter.cs
+++ b/plist-cil/BinaryPropertyListWriter.cs
@@ -240,7 +240,7 @@ namespace Claunia.PropertyList
             long[] offsets = new long[idDict.Count];
 
             // write each object, save offset
-            foreach(var pair in idDict)
+            foreach (var pair in idDict)
             {
                 NSObject obj = pair.Key;
                 int id = pair.Value;
@@ -422,11 +422,18 @@ namespace Claunia.PropertyList
                 || content == "$classname"
                 || content == "NS.objects"
                 || content == "NS.keys"
+                || content == "NSURL"
                 || content == "NSDictionary"
                 || content == "NSObject"
                 || content == "NSMutableDictionary"
                 || content == "NSMutableArray"
-                || content == "NSArray";
+                || content == "NSArray"
+                || content == "NSUUID";
+        }
+
+        internal static bool IsSerializationPrimitive(NSNumber n)
+        {
+            return n.isBoolean();
         }
     }
 }
diff --git a/plist-cil/UID.cs b/plist-cil/UID.cs
index 3263995..3dd1a8e 100644
--- a/plist-cil/UID.cs
+++ b/plist-cil/UID.cs
@@ -338,6 +338,12 @@ namespace Claunia.PropertyList
         {
             return this.value.GetHashCode();
         }
+
+        /// <inheritdoc/>
+        public override string ToString()
+        {
+            return $"{this.value} (UID)";
+        }
     }
 }