repeated table not shown when (comment:false,compact:true)

[sourcevault]

local constant = {'hello','world'}
local tab = {constant,constant}
print(serpent.block(tab,{comment:false,compact:true}))

OUTPUTS :

{                
  {              
    "hello",     
    "world"      
  },             
  nil,           
  nil            
}                

Is it possible to repeat show repeated tables ? Seems like a bug. nil seems like misleading.