Google Classroom querysubmissioncsv parameters

Question

Does anyone know what the parameters mean for querysubmissioncsv?

I get this link when I click "Copy all grades to Google Sheets":

https://classroom.google.com/querysubmissioncsv?r=%5B%5B1000%5D%2C%5Bnull%2Cnull%2Cnull%2Cnull%2Cnull%2Ctrue%2Ctrue%2Ctrue%5D%2C%5Bnull%2C%5B%5D%2C%5B%5D%2C%5B%5D%2C%5B%5B%%22%5D%5D%5D%2C%5B1%2C1%5D%5D&authuser=0

Replacing the characters, you get this:

https://classroom.google.com/querysubmissioncsv?r=[[100],[null,null,null,null,null,true,true,true],[null,[],[],[],[["CLASSID"]]],[1,1]]&authuser=0

Except for the class ID, I'm not sure what anything else means. Does anyone have a clue?