testthat (>= 0.11.0), roxygen2, knitr, rmarkdown,
microbenchmark, bit64 (>= 4.0.0), ff (>= 4.0.0)
testthat (>= 0.11.0), roxygen2, knitr, markdown, rmarkdown,
microbenchmark, bit64 (>= 4.0.0), ff (>= 4.0.0)