PageRank not sending the correct values in Pergel sendMessage

The core sendMessage method is incorrect:

def sendMessage(edge: EdgeTriplet[(Double, Double), Double]) = {
 if (edge.srcAttr._2 > tol) {
   Iterator((edge.dstId, edge.srcAttr._2 * edge.attr))
                          // *** THIS ^ ***
 } else {
   Iterator.empty
 }
}

Instead of using the source PR value, it's using the PR delta (2nd tuple arg). This is not the documented behavior, nor a valid PR algorithm AFAIK.

This is a 7 years old code, all versions affected.