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I was a bit annoyed by the error when loading a dataset that contains multi-byte characters. R basically just chokes on them. I have not really understood the intricacies of this, but it was basically just an annoyance and since I did not really use these characters in the strings containing them, I just wanted to remove them.
The easiest solution was to use Vim with the following search and replace:
s/[\x80-\xFF]//g
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