[R] I() in data.frames

[Jim Lindsey]

 I avoid dataframes so just noticed this in 1.5.1:

> r <- rbinom(10,5,0.5)
> data.frame(y=I(cbind(r,5-r)))
Error in data.frame(y = c("2", "3", "4", "5", "2", "2", "1", "0", "3",  : 
        row.names should specify one of the variables

This worked up until and including 1.1.x, but not since (which shows
how often I use them!).
  Is this a feature, and if so, how does one now keep a two column
response variable in a dataframe now?
  Jim
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