This blog is updated daily.
A general description is here.
‘R CMD build’ when there is no ‘NAMESPACE’, now uses the recommended ‘exportPattern("^[^.]")’, instead of exporting everything.
‘is.R()’ is deprecated as no other S dialect is known to be in use (and this could only identify historical dialects, not future ones).
Further information on calls can be obtained by setting the environment variable ‘_R_DEPRECATED_IS_R_’ to ‘error’ which turns the deprecation warning into an error and so by default gives a traceback. (This is done by ‘R CMD check --as-cran’.)