1.2 What the heck is rlang?

• tidy eval framework to make things easier for users
• rlang errors framework for easier-to-understand messaging
  • now shared with {cli}
• argument intake tools for checking/validating/preprocessing args
  • usethis::use_standalone("r-lib/rlang", "types-check") (dev usethis)
• programming interfaces to work with R and R objects