Bug in read.dcf(all = TRUE)?

Hi,

read.dcf() can modify the locale variable LC_CTYPE, and here is a
minimal example:

Sys.getlocale('LC_CTYPE')

[1] "en_US.UTF-8"

read.dcf(textConnection('a: b'), all = TRUE)

a
1 b

Sys.getlocale('LC_CTYPE')

[1] "C"

After diagnosing the problem, it seems the on.exit() call in
read.dcf() is the culprit:

    on.exit(Sys.setlocale("LC_CTYPE", Sys.getlocale("LC_CTYPE")), add = TRUE)
    Sys.setlocale("LC_CTYPE", "C")

https://github.com/wch/r-source/blob/96a2cc920/src/library/base/R/dcf.R#L68-L69

sessionInfo()

R version 3.1.0 (2014-04-10)
Platform: x86_64-pc-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
LC_TIME=en_US.UTF-8
 [4] LC_COLLATE=en_US.UTF-8     LC_MONETARY=en_US.UTF-8
LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
LC_ADDRESS=C
[10] LC_TELEPHONE=C             LC_MEASUREMENT=en_US.UTF-8
LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] tools_3.1.0


Regards,
Yihui
--
Yihui Xie <xieyihui at gmail.com>
Web: http://yihui.name