- For priority args (first ones), pull out the ones that are required!
- swap vl_add_<>config for vl_config<> formatting (but keep old format as deprecated)
- specialized data functions vl_add_data_url, vl_add_data_values
- Sugar for vl_chart or data -- if single value is passed do the right thing...
- "repeat:column" sugar for encoding
- if single field (e.g. filter) allow to pass unnamed to .object
- vl$ for make object functions
- Roxygen consolidation -- use eval
- tooltip sugar -- should be able to take array
- Add examples for add_parameter
- Add documentation!
- Code cleanup -- remove use of $