Add article about boxing bools in C#

content/articles/dotnet/boxing-bools.md

@@ -0,0 +1,26 @@
+---
+title: Boxing bool values
+topics:
+- csharp
+- dotnet
+- boxing
+---
+
+When boxing value types in C#/.NET, an object on the heap is created.
+
+**What happens when you box a `bool` value?**
+
+Since there are only two possible values, are the box objects reference equal?
+
+The answer is: **No. For example, boxing `true` twice results in different objects.**
+
+Consider this code:
+
+```c#
+var obj1 = (object)true;
+var obj2 = (object)true;
+
+Console.WriteLine(ReferenceEquals(obj1, obj2)); // prints "false"
+```
+
+There are not even {{< abbr "BCL" "Base Class Library" >}} constants for `true` and `false` (unlike Java). This issue is behavior is discussed in this [GitHub issue](https://github.com/dotnet/runtime/issues/47596).

content/articles/dotnet/boxing-nullable-value-types.md

@@ -3,6 +3,7 @@ title: Boxing Nullable Value Types in C#
 topics:
 - csharp
 - dotnet
+- boxing
 ---
 
 A nullable value type value (e.g. `int?`) loses its nullability type information when it's boxed: