I think the catch is that "microlibraries" can still contain reasonably large amounts of functionality that's non-trivial to replicate. I'd be happy enough to

I think the catch is that "microlibraries" can still contain reasonably large amounts of functionality that's non-trivial to replicate. I'd be happy enough to import single-function dependencies for "urlencode" or "is_valid_email" rather than manually grow out all the edge cases (again).