JavaForkOptions. This may require some work as currently Grolifant only support fork configuration as part of a task that implements a ForkedJvmExecutable.
TaskProvider. There are a number of places that uses the legacy TaskProvider from Grolifant in a way where there is no new suitable replacement.
Asciidotor.convertFile. Curretnly the Asciidoctor API does not allow for inspection of the Option object and the old Map methods are all deprecated.
We are now left with the following: