c(
    person("Hadley", "Wickham", , "hadley@rstudio.com", role = c("aut", "cre")),
    person("R Core team", role = "ctb",
           comment = "Some code extracted from base R")
  )
Useful tools to pry back the covers of R and understand the
    language at a deeper level.
codetools, lobstr, methods, Rcpp (>= 0.11.0), stringr
Hadley Wickham [aut, cre],
  R Core team [ctb] (Some code extracted from base R)