TODO

1.5
- docstrings examples to bears
- pd.DataFrame().to_redframes()
- to_pandas / (to_csv / to_dict)
- rf.read_csv() / rf.from_csv()
- deprecate io functions
- replace `__str__`
- from_dict, from_pandas, from_csv, from_excel?

1.6
- reorder/move columns to front / end / before / after
- tally verb
- complete verb (tidyr)

1.7
- warning on multiple columns in mutate (override) or fix?
- expose @extension

2.0
- explicit * keyword arguments
- remove deprecated functions/methods

Later
- complete verb (tidyr)
- hide/protect/private methods/attributes
- cheatsheet & tutorial

Maybe
- slice verb
- log verb (Untitled12)
- builtin datasets
- vectorized mutate support (`.assign` mutate(..., vectorized=True))?
- polars/arrow backend
- class RedList(list): ...?
- speedtests