Memory efficient parsing in GO

Instead of greedily reading the whole stream in memory and passing it to json.Unmarshal:

json.Unmarshal(bigBlobOfData, &myStruct)

We can delegate the stream reading to our dear masters of golang:

json.NewDecoder(myIOReader).Decode(&myStruct)

And read multi giga(tera?)bytes files with no sweat. Also works with xml.NewDecoder.