Holes in Skimmer Basket

I've never seen that. Turn the pump on and see what happens. May be a valve that adjusts flow from that port as it may be a dedicated suction line. That's how I would find out.
It runs perfectly fine and it provides no suction or anything. I was just curious if anyone has seen this before and what it might be, because I can’t find anything online. It’s a threaded pipe as well so I was going to try plugging it and see what happens. This house is from the 70’s and as far as I know the pool is original.
 
Confused Season 6 GIF by The Masked Singer


I haven't seen a stumped crew yet on TFP...a first. But lets see if @mas985 or @JamesW has any idea. Let's include @mknauss @Newdude @JoyfulNoise