misc kw utils
main documentation: http://pkg-build.racket-lang.org/doc/kw-utils/index.html
- Keywords in Hash Tables: https://docs.racket-lang.org/kw-utils/Keywords_in_Hash_Tables.html
- Keywords in Parallel Lists: https://docs.racket-lang.org/kw-utils/Keywords_in_Parallel_Lists.html
- Procedure arities with keywords: https://docs.racket-lang.org/kw-utils/arity_keywords_scrbl.html
- Higher Order Functions with Keywords: https://docs.racket-lang.org/kw-utils/Higher_Order_Functions_with_Keywords.html