What difference (object and sequence)

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Is there any difference (size, performance, etc.)
   between declaring a variable as an object
   and declaring it as a sequence,
   other than type checking?

example:
function F_A (object item)
--do something
return item
end function

function F_B (sequence item)
--do something else
return item
end function


--test---
sequence xxx, yyy
xxx = {441, 1232, "dog", "cat"}
yyy = F_A(xxx)  --pass xxx back as an object, return an object
yyy = F_B(xxx)  -- pass xxx as a sequence, return a sequence
printf(1,"\ndone\n",{})

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