Hi, I am testing how pnpm works on some of the most popular Node packages. I was doing a pnpm install on the rxjs repo and I noticed that the prepublish script failed because popsicle-retry could not find popsicle.

I understand that this works with npm@3 and yarn, as they create a flat dependency tree, but is there a reason not to include popsicle as a dependency? You can at least include it as a peerDependency, I think.
It doesn't make sense to have it in devDependencies. You either need it in dependencies or in dev deps + peer deps, am I right?