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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