WhenAnyValue on property of nullable object

[brignolff]

Hi,

I was experimenting with ReactiveUI WhenAnyValue() and found that when you use WhenAnyValue on a property of a nullable object, if the object is a some point null, the output property does not update.

Expected behavior :

I thought that output property would be null after my nullable object was set to null.

Code to reproduce :

Code.md
the commented line gives what I expect.

Please tell me if it's something expected or not.