Hot reload in Visual Studio breaks DotVVM binding compilation

[OronDF343]

Hot Reload can break value bindings to Nullable<T> as well as certain others when the page markup is (re)compiled. The compilation fails with the exception System.NotSupportedException: Method BoxingUtils.Box cannot be translated to Javascript.

The shortest repro example is:

{{value: DateTime.Today.Year}}

Usually I experience this with any binding to a property of type int?, for example:

public int? TestProp { get; set; } = 12345;

{{value: TestProp}}

1. Debug the application in Visual Studio
2. Make any small change in the code, anywhere in the application. For example, add a useless local variable to a method somewhere
3. Click the Hot Reload button (flame icon)
4. Optional: To make sure that the example page will be recompiled, change the content of the dothtml slightly in any way. This is not necessary if the page wasn't compiled yet
5. Browse to the example page. Compilation will fail

Here is the full error page from my environment:
dotvvm-error-NotSupportedException.zip

[OronDF343]

As of the latest version, the exception message has changed slightly:

System.NotSupportedException:
Method DotVVM.Framework.Utils.BoxingUtils.Box(int? v) -> object cannot be translated to Javascript