Typically one postgres extension would have only one plugin library. So, the idea is that one crate would produce one plugin. I guess it's possible to have more

Typically one postgres extension would have only one plugin library. So, the idea is that one crate would produce one plugin. I guess it's possible to have more than one plugin per extension, but it never occurred to me and I haven't seen that before. Having the location of the plugin might also allow "cargo install" to work.