All documentation is available on the website at
https://package.elm-lang.org/packages/AUTHOR/PROJECT/VERSION/, but the search is implemented in a way that will only show 0.19 packages.
Why? In effort to reduce the amount of data sent to the search page, the new server creates a list of all the packages published with 0.19 to populate the search page. It also trims out a bunch of version information, which is especially helpful for packages with 20+ major releases. So this ends up being quite a bit smaller! This change happened before the
elm name change though, so this ended up being much more disruptive than it appeared at the time. The root architecture changes in the server would be relatively risky to mess with, so instead, a community member made an alternate search that works for folks working with 0.18.