[R-Forge #5613] order and base::order give different results

[arunsrinivasan]

Submitted by: Christian Wolf; Assigned to: Nobody; R-Forge link

This is with revision 1263.

library(data.table)
my.dt <- data.table(a=c("$","€","+",0,1,"a","A"))
my.dt[base::order(a)]
#    a
#1: $
#2: €
#3: +
#4: 0
#5: 1
#6: a
#7: A

my.dt[order(a)]
#    a
#1: $
#2: +
#3: 0
#4: 1
#5: A
#6: a
#7: €

[arunsrinivasan]

From v1.9.3+, DT[order(.)] is optimised to use internal fast order, which by default, always sorts in C-locale. This is therefore not a bug, rather should be documented (maybe as a FAQ as well). Changed from bug to documentation. Tagging Rdatatable/www#1

[arunsrinivasan]

Also related to #704