This blog is updated daily.
A general description is here.
There is some support for ‘zstd’ compression of tarballs in ‘tar()’ and ‘untar()’. (This depends on OS support of ‘libzstd’ or by ‘tar’.)
‘R CMD check’ gains option ‘--run-demo’ to check demo scripts like tests.
‘R CMD build’ now supports ‘--compression = zstd’ on platforms with sufficient support for ‘zstd’.
‘R CMD check’ with a true value for environment variable ‘_R_CHECK_BASHISMS_’ checks more thoroughly, including for ‘bash’ scripts and bashisms in components of ‘autoconf’-generated ‘configure’ scripts.