R-alpha: factors ...

Perhaps someone can enlighten me here:

R> x <- factor(LETTERS[1:3])
R> x
[1] A B C
R> mode(x)
[1] "factor"
R> class(x)
[1] "factor"
R> mode(unclass(x))
[1] "factor"

S-PLUS has

x <- factor(LETTERS[1:3])
mode(x)

[1] "numeric"

class(x)

[1] "factor"

mode(unclass(x))

[1] "numeric"

???
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