Message Title

As PersistenBag implements List it should adhere to the interface truthfully. Given a LinkedList l and a PersistentBag b, each containing only Objects having the same value, but not being the same instance leads to the following behavior:

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

    It is reflexive: for any non-null reference value x, x.equals(x) should return true.
    It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
    It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
    It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
    For any non-null reference value x, x.equals(null) should return false.