I noticed (in horror!) that uninstalling a package that installs custom data types (e.g. in order to install a newer version) not only does not uninstall those custom data types (everything else like doctypes, views etc. is uninstalled correctly) but then installing a version of the same package that installs modified data types with the same names has no effect - data types are not updated.

So there are two potential problems there - has anybody spotted that so far? I tested on a brand new nuget install, package was made with Umbraco 7.4, install was 7.5.3, but I suspect this is by design and not a version-specific issue. (Is it?)