Replacing the functions that required the older version of glibc might seem trivial, but I've seen countless devs beat their head against the wall trying to get conflicting NPM packages to work for what is essentially the same problem.

Criticism of the NPM / Node ecosystem aside (leftpad, etc) - this is a great reminder of a lesson I should be including when mentoring other devs: never hesitate to dig into a dependency, figure out how it works, and even rewrite it yourself if/when it makes sense. Removing the "magic" of libraries and dependencies is a really enlightening moment for new developers!