Should allow null references as constructor parameters.

[WalkerCodeRanger]

The overloads of new Mock<T>() that take params object[] args to pass on to the constructor of the class ought to allow null arguments (e.g. object?[] args).

[stakx]

null is definitely allowed, see e.g. here:

https://github.com/moq/moq/blob/06d88ec526b2d879fa3520e4daed3abcd451953e/src/Moq/Mock%601.cs#L305-L308

What is missing, however, are nullable reference type annotations in all of Moq's public API. It would be nice to add those sometime.

P.S.: regarding these annotations, I've opened a separate issue for them; see #1418.