Maybe we can fix this.
```
lager.erl:213: The call lager_util:trace_filter('none') will never return since it differs in the 1st argument from the success typing arguments: (nonempty_maybe_improper_list())
lager_app.erl:103: The call lager_util:trace_filter('none') will never return since it differs in the 1st argument from the success typing arguments: (nonempty_maybe_improper_list())
lager_util.erl:360: The call lager_util:trace_filter(Module::any(),{'null',boolean()}) will never return since it differs in the 2nd argument from the success typing arguments: (any(),nonempty_maybe_improper_list())
```