And a third question: when using the compiler plugin, is type resolution enabled by default? The documentation implies it isn't, but there is no mention about how to enable it (it all refers to the various gradle tasks provided by the gradle plugins, where are not available anymore since I replaced it by the compiler plugin).

Yes TR is enabled by default (that’s the whole point behind Compiler Plugin).

TR being enabled makes complete sense, but I got really confused by the wording. Yes, I'll send a PR shortly!