Contrary to, say, Sys.setenv(), Sys.setlocale() returns it's value
visibly. This means that if you for instance add:
Sys.setlocale("LC_COLLATE", "C")
to your .Rprofile file, it will print:
[1] "C"
at startup. The workaround is to wrap the call in invisible(), but I'd
argue that any "setter" function should return invisibly.
Some more details:
> withVisible(Sys.setlocale("LC_COLLATE", "C"))
$value
[1] "C"
$visible
[1] TRUE
> withVisible(Sys.setenv(FOO = "C"))
$value
[1] TRUE
$visible
[1] FALSE
/Henrik
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