Follow-up from: dart-lang/sdk#58088. - [x] `prefer_final_locals` and `unnecessary_final` - [x] `prefer_single_quotes` and `prefer_double_quotes` - [x] `omit_local_variable_types` and `always_specify_types` - [x] `prefer_typing_uninitialized_variables` and `omit_local_variable_types` Others?
