👉 Unpervasiveness is a concept in programming languages and software development that refers to the difficulty or inability of an object to persist across multiple invocations. It is often associated with objects that are immutable, meaning they cannot be modified after creation, such as arrays, sets, maps, etc. In other words, if an object's value can change after it is created, it is considered unpervasively mutable, and the programmer must ensure that all changes made to the object are reflected in subsequent inv