public function compareForConflict(\stdClass $statement_x, \stdClass $statement_y)
{
$matchable_x = $this->matchableStatement($statement_x);
$matchable_y = $this->matchableStatement($statement_y);
if ($matchable_x != $matchable_y) {
$encoded_x = json_encode($statement_x);
$encoded_y = json_encode($statement_y);
throw new Exceptions\Conflict("Conflicts\r\n`{$encoded_x}`\r\n`{$encoded_y}`.");
}
}