Gradients of Immutability

Good objects are immutable, but not necessarily constants. I tried to explain it here, here, and here, but now it's time to make another attempt. Actually, the more I think about it, the more I realize that immutability is not black or white—there are a few more gradients; let's take a look.

Twelve Monkeys (1995) by Terry Gilliam

As we agreed here, an object is a representative of someone else (some entity or entities, other object(s), data, memory, files, etc.). Let's exam...