# System.Runtime.CompilerServices

``` diff
 namespace System.Runtime.CompilerServices {
     public static class RuntimeHelpers {
+        public static object? Box(ref byte target, RuntimeTypeHandle type);
+        public static int SizeOf(RuntimeTypeHandle type);
     }
     public static class Unsafe {
-        public static TTo BitCast<TFrom, TTo>(TFrom source) where TFrom : struct where TTo : struct;
+        public static TTo BitCast<TFrom, TTo>(TFrom source);
     }
 }
```

