I only resurrected this 15-day-dormant thread because I noticed something no one else had 
Dozens of people worked on creating clunky UTF-16 but two geniuses came up with beautiful UTF-8; which one won? The point being just because only one person noticed the congruence with positional-only arguments doesn’t discredit it. /
I agree that there may not be consensus on the syntax and that courage to commit to one should be taken. I do like the motivation though. (), [], {}, {/} besties.
Also I have opened a PR for a slight change in the wording of the mention of my post in the PEP. I perhaps should’ve made it clearer that I’m in favor of allowing spaces like { / }.
I’ve tried the reference implementation and it’s looking good.