Redundant code?

Created by: h0wn0w

This could just be a limitation of my knowledge of bespoke css, but it seems there is redundant code in /dist/css/bootstrap.css (and, presumably in the .min file).

Lines 723 - 761 contain repeats, e.g.,

.container:before,
.container:after {
  display: table;
  content: " ";
}

.container:after {
  clear: both;
}

.container:before,
.container:after {
  display: table;
  content: " ";
}

etc. I did not see this anywhere else in the .css issues, so I apologize if this is known.