install(reload = TRUE) now calls pkgload::unregister() instead
of pkload::unload() (#2349). This allows the package to keep
functioning if it is still in use in the R session (e.g. through
event handlers).

test() no longer calls load_all() twice. test_active_file()
now calls load_all() via testthat.

aspell_env_var() does a better job of matching R CMD check behaviour,
which is only to use aspell, not hunspell or ispell (#2376).

Installing devtools now installs pkgdown, profvis, bench, miniUI,
and urlchecker, ensuring that you have everything needed for package
development (#2388).

dev_sitrep() has been updated for the calendar-based version number scheme
adopted by the RStudio IDE in September 2021 (#2397, #2410).