Evaluates a final value in reverse, attempting to determine a base value from the modifiers within all of the channels. The operation proceeds through all channels in reverse order, with the result of the evaluation of an individual channel used as the new final value to the channel that precedes it numerically. If any channel has a condition that prevents it from computing correctly (such as an override mod), this function just returns the original final value. This is predominantly used for filling in base values on clients from replication for float-based attributes.