title: Weird error in R when importing (64-bit) integer with many digits
body: <p>I am importing a csv that has a single column which contains very long integers (for example: 2121020101132507598)</p>
  
  <blockquote>
    <p>a&lt;-read.csv('temp.csv',as.is=T)</p>
  </blockquote>
  
  <p>When I import these integers as strings they come through correctly, but when imported as integers the last few digits are changed. I have no idea what is going on...</p>
  
  <blockquote>
    <p>1   "4031320121153001444"  4031320121153001472<br>
    2   "4113020071082679601"  4113020071082679808<br>
    3   "4073020091116779570"  4073020091116779520<br>
    4   "2081720101128577687"  2081720101128577792<br>
    5   "4041720081087539887"  4041720081087539712<br>
    6   "4011120071074301496"  4011120071074301440<br>
    7   "4021520051054304372"  4021520051054304256<br>
    8   "4082520061068996911"  4082520061068997120<br>
    9   "4082620101129165548"  4082620101129165312<br></p>
  </blockquote>