[Not a bug] duplicate $cheapest in notify

[twitchtoo]

Found in 1.55f and 1.56a

includes/classes/shipping.php
line 213...
$this->notify('NOTIFY_SHIPPING_MODULE_CALCULATE_CHEAPEST', $cheapest, $cheapest, $rates);
return $cheapest;

[lat9]

I believe that the first (read-only) $cheapest is for compatibility, which the second (read-write) version allows an observer to make modifications.

[DrByte]

I believe that the first (read-only) $cheapest is for compatibility, which the second (read-write) version allows an observer to make modifications.

Correct.