No, that is just normal URL encoding %5b%5d is [], indicating that the argument should be treated as an array. I know that many systems will also create an array from the argument name if it simply passed more than once in the argument list. I.E. secondlist=1,secondlist=2,secondlist=3 would create the array secondlist = [1,2,3]. But secondlist[]=1,secondlist[]=2,secondlist[]=3 is the correct way to tell the server that secondlist = [1,2,3].
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