It's not. For starters you need to get the repo, make a branch, do the changes add tests, you may need an account to raise the PR on whatever platform, then the

It's not. For starters you need to get the repo, make a branch, do the changes add tests, you may need an account to raise the PR on whatever platform, then there's possibly a CLA to raise. Whereas whoever raised the submission in the first place probably has some interaction with the project, therefore mentioning this in HN could then be taken by the submitter and raised as a feature request so someone could make a PR.