In addition to put IV in RAM, you could also run code in RAM, or allocate constants in RAM. Normal practice is, you do not intentionally change IV, code, or constants. Thus you are not gaining the advantage of being able to change them intentionally, you only opened the possibility of incidentally changing them. However, if there is a need to change IV intentionally, there is nothing wrong with put IV in RAM. You will need code and constants to set it up thou. Those code and constants probably should not be in RAM, otherwise you get yourself a catch-22 situation.
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