# NOT RUN {
## The function is currently defined as
function (left, right)
{
test_ = function(k) {
if (is.na(left[[k]]) & is.na(right[[k]]))
NA
else if (is.na(left[[k]]))
2
else if (is.na(right[[k]]))
0
else if (left[[k]] == right[[k]])
1
else 3
}
sapply(seq_along(left), FUN = test_)
}
# }
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