Khafra

Sorry for not finishing this, I have finals soon and very little time in the meantime. :(

I don't view this as a bug. At most, the error could be improved.

> I don't understand what's the workaround? There are a few, but one for library authors: ```ts import { FormData as UndiciFormData, request } from 'undici' function globalToUndiciFormData(fd: globalThis.FormData): UndiciFormData...

> Debugging found that the difference before/after gc is that the "dependentControllerMap" entry for the signal is missing [here](https://github.com/nodejs/node/blob/269c8512409ce88e6af6f5f7dbaca0cb773bfbd7/deps/undici/src/lib/web/fetch/request.js#L60) This looks familiar to another issue with fetch/signals caused by the...