This processor allows calculations to be done on each element of a collection or object.
object to process.
input element, the array/object key is stored in VarTemporary under this key string.
input element, the array/object value is stored in VarTemporary under this key string.
item_val_key are pre-calculated.
Each element in
input is fetched in turn, stored as a
<for_each_item id>.key and
<for_each_item id>.key keys), and
process_loop is run.
Once each element has been processed, if there is any logic to run in
process_after, then that logic will be processed.