Thanks to GitHub user yu45020 dummy_cols() is now about >20% faster and much more memory efficient.
e.g. data.frame input returns data.frame, tibble returns tibble.
Fix documentation that incorrectly said default value for new dummy rows is 0. It is in fact a value of NA.
Reduces number of parameter that were in previous version.
Significant speed increases for both dummy_cols() and dummy_rows() functions.
dummy_cols() now accepts numeric columns.