Allow Faking of non-generic types with methods that have in parameters

As mentioned in #1337, and due to castleproject/Core#339, types containing a method with an in parameter cannot be faked by FakeItEasy .NET Standard, and if the type is a generic type, it cannot be faked by either the FakeItEasy .NET Standard or .NET Framework editions.

Once Castle.Core supports these scenarios, we should do so as well.

[blairconrad]

Yes, thanks @zvirja. And @thomaslevesque for verifying. I’d meant to look last night, but we’re expecting houseguests, and the vacuuming sucked up (ha!) all my time.

[thomaslevesque]

@zvirja I just checked. Faking delegates with in parameters works, but the read-only semantics is not honored, e.g. this will print 123:

delegate void Foo(in int x);
...
var foo = A.Fake<Foo>();
A.CallTo(() => foo(A<int>.Ignored)).AssignsOutAndRefParameters(123);
int z = 0;
foo(z);
Console.WriteLine(z);

Thanks for bringing this to our attention. I’ll open a new issue.