Adding `sort' in R makes the output fail

[Sebastien Vauban <sva-news-D0wtAvR13HarG/iDocfnWg@public.gmane.org>]

Hello,

The following code does return a corrupted answer, while it's supposed
to return a sorted dataframe.

--8<---------------cut here---------------start------------->8---
#+BEGIN_SRC R :results value replace
con <- textConnection("
index	email
A	abc-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org
B	def-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org
C	def-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org
D	ghi-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org
E	abc-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org
F	def-hcDgGtZH8xNBDgjK7y7TUQ@public.gmane.org")
df <- read.table(con, header = TRUE)
sort(table(df$email))
#+END_SRC

#+results:
| 1 |
| 2 |
| 3 |
--8<---------------cut here---------------end--------------->8---

See video at http://screencast.com/t/4u4Sj1Mkycwp to see the effect of
adding `sort', and see the output in RStudio (correct in both cases:
with and without `sort') on the right side of the video.

What's wrong here?

Best regards,
  Seb

-- 
Sebastien Vauban