adds or manipulates a value to an attribute of type N(umber) or S(et), manipulation behaviour differs based on attribute type
appends one or more values to the start or end of a list, value must be of type L(ist)
removes an item at the given position(s), the remaining elements are shifted
will update the item at the path, path can be a top level atribute or a nested attribute. samples:
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see http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.UpdateExpressions.html for full documentation