During my day job as an iOS developer I heavily rely on Dash. Basically, I have no idea what I'm doing and Dash helps me to cover that. Well, it was helping me: Something went wrong with Xcode 12 and so the Apple API-docs in Dash are broken. Hopefully, this will be fixed in the near future. Until then I'm grateful, that the documentation in Xcode doesn't seem to be affected 🙂
There's a short text explaning the issue in Dash:
I just found a little workaround: When the error message appears, I open the Xcode Documentation and do a CMD+R in Dash afterwards. And booom, there it is. Now I'm confused.