- [x] provide different sets of extensions for the same backend with the different IDs - https://github.com/trussed-dev/trussed/pull/153 - [ ] warn if an extension is declared but not implemented - [x] support optional backends - https://github.com/trussed-dev/trussed/pull/158 - [x] add `skip` option, e. g. for `PhantomData` - https://github.com/trussed-dev/trussed/pull/153 - [x] add `no_core` option to skip core requests - https://github.com/trussed-dev/trussed/pull/153