the bug seems to have a trivial solution; as far as i can see, it suffices to
replace
if (!is.logical(incomparables) || incomparables)
with
if(!identical(incomparables, FALSE))
in all its occurrences in src/library/base/R/duplicated.R
attached is a patch created, successfully tested
Full_Name: Wacek Kusnierczyk
Version: 2.8.0 and 2.10.0 r48242
OS: Ubuntu 8.04 Linux 32 bit
Submission from: (NULL) (129.241.110.161)
In the following code:
duplicated(data.frame(), incomparables=NA)
# Error in if (!is.logical(incomparables) || incomparables)
.NotYetUsed("incomparables != F
