Thanks -- fixed in R-devel and R-3-5-branch.


On Fri, 6 Apr 2018, Suharto Anggono Suharto Anggono via R-devel wrote:

In the code of functions 'order' and 'sort.list' in R 3.5.0 alpha (in, in "fastpass, 
take advantage of ALTREP metadata", there is "try the reverse since that's easy 
too...". If it succeeds, ties are reordered, violating stability of sorting.

x <- sort(c(1, 1, 3))
x  # 1 1 3
sort.list(x, decreasing=TRUE)  # should be 3 1 2

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Luke Tierney
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