title: Convert `ï¿½` string to diamond question mark symbol (�) in R
body: <p>I have been using the <code>googlesheets</code> package to upload and download data from a websheet. Previously, it had been downloading strings with non-ASCII symbols with the icon �. Now, for no apparent reason, it has started downloading them with the following string: <code>ï¿½</code>. How can I convert <code>ï¿½</code> to the diamond questionmark symbol (�)?</p>