[Rd] rbind.data.frame converts logical to factor (PR#1536)

[tlumley@u.washington.edu]

> df<-data.frame(a=1:10)
> df$b<-df$a<5
> is.factor(df$b)
[1] FALSE
> ddf<-rbind(df,df)
> is.factor(ddf$b)
[1] TRUE


platform i386-pc-linux-gnu
arch     i386
os       linux-gnu
system   i386, linux-gnu
status
major    1
minor    5.0
year     2002
month    04
day      29
language R



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