I've been thinking about that when working with recurrence rule libraries. It's a standard about calendaring and there's millions of edge-cases: developping you

I've been thinking about that when working with recurrence rule libraries. It's a standard about calendaring and there's millions of edge-cases: developping your own library for prod purposes is a huge risk and most of the effort would probably be in tests. If all these projects shared a test suite, they could: - Fix their own existing bugs - Help other projects to fix their bugs - Be explicit about what they support and what they don't - Help writing new libraries (eg in a faster language, or for another ecosystem)