[Rd] Sticky levels (PR#846)

[bwheeler@echip.com]

This isn't actually a bug, but what is one to do
in cast of a typo?

> citizen<-factor(c("uk","as","no","au","uk","us","us"))
> levels(citizen)
[1] "as" "au" "no" "uk" "us"
> citizen[2]<-"us"
> citizen
[1] uk us no au uk us us
Levels:  as au no uk us    ** [STICKY "as"] **
> citizen[2]<-"gs"
Warning message: 
invalid factor level, NAs generated in:
[<-.factor(*tmp*, 2, value = "gs")

-- 
Bob Wheeler --- (Reply to: bwheeler@echip.com)
        ECHIP, Inc.

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