How does the dupe detector work anyway. First I thought one could resubmit after a certain amount of time... but no, I submitted this only a day or two ago. May

How does the dupe detector work anyway. First I thought one could resubmit after a certain amount of time... but no, I submitted this only a day or two ago. Maybe links can be modified (add a ?resubmit at the end, for instance), but nope, I submitted with exact same URI. I wonder. (Not complaining, just curious if anyone has insight into this).