[Rd] embeded R application on Windows prints broken character.

[Randy Lai]

The issue was reported to me for https://github.com/randy3k/rtichoke/issues/50
which is a python program which embeds R and provides a interface to R.

With R 3.5, for reason which i don't understand, when I typed `"a"` in the console
STDOUT got `"\x02\xff\xfea\x03\xff\xfe"` with the extra escaped characters.

I notice that `\x02\xff\xfe` and `\x03\xff\xfe` are encoding related byte marks.
A clear solution is to filter the escaped characters, but I want to understand what
changes are causing it happens. It didn’t happen for R 3.4.


Randy



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