title: R import large csv with commas with double backslash in readr or data.table
body: <p>I'm having trouble importing a large csv file (17m rows) into R.  I've tried using both <code>readr::read_csv</code> and <code>data.table::fread</code> but both are creating extra columns.  This is because one of the columns has some text that includes commas.  When I read the file with <code>readLines</code>, I can see that the commas within the text are preceded by a double-backslash so they should be ignored, however I can't get either package to ignore them... Any suggestion?
  An example would be:</p>
  
  <pre><code>id,title
   1,great expectations
   2,great expectations\\, the sequel
  </code></pre>