The commit adds undici (another Node.js project at https://github.com/nodejs/undici ) as a dependency and exposes its `fetch` - the code changes you see are probably just adding a flag :)

> I just wonder how come features like this that kind of seems obvious to include in the ecosystem takes quite some time to land?

I answered that below (check it out) but note how expensive adding a bad API is vs. asking people for one more `npm install` :) There is more discussion in https://github.com/nodejs/node/issues/19393 and in https://docs.google.com/document/d/1tn_-0S_FG_sla81wFohi8Sc8... a discussion from 2018 we had on it