I'm happy to hear that but I had a very small part in it all!
The person who took it through the finish line (and deserves the most props here IMO) is Michael https://github.com/targos
The people who worked most on Undici are Matteo https://github.com/mcollina and Robert https://github.com/ronag
The person to work most on fetch in Undici is Ethan https://github.com/Ethan-Arrowood
Also worth calling our James whose work on web streams in Node as well as events/cancellation helped drive a bunch of this.
I can name maybe 50 people who worked on this effort overall at some capacity (I am one of them - spending maybe 40 years on APIs to help enable this).
Note the job isn't entirely done and help is very much appreciated!