BTW, I've seen that One<> is also missing DeepCopyNew()... when I use operator <<= to get
a deep copy of contained object I get a compiler error.
Uhm, that is leftover from pre c++11 Core. DeepCopyNew was means to allow polymorphic copy, but I do not remember anybody ever using it. For current core it is replaced (in Array) with simple clone (non-polymorphic), so that is how I have fixed it here...