Ah and if you know exact use case I needed this for then it was exactly what this function is for. To be exact: I have a list of bitcoin transactions. Sometimes it happens that someone sends a transaction with multiple output addresses which are the same. At first I assumed that I can divide bitcoin transactions into parts by using unique address and TX, but when I learned that there might be a scenario like this I figured that the easiest would be to merge those actually (like add the values of each output to the same address and make them as one transaction in my system). That's why I needed to merge all the elements of the list that match some function call and are merged in a certain way.
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