This blog is updated daily.
A general description is here.
‘optim(*, control = list(warn.1d.NelderMead = FALSE))’ allows to turn off the warning when applying the default ‘"Nelder-Mead"’ method to 1-dimensional problems.
‘match.arg()’ more carefully chooses the environment for constucting default ‘choices’, fixing PR#17401 as proposed by Duncan Murdoch.
All packages are by default byte-compiled on installation. This makes the installed packages larger (usually marginally so) and may affect the format of messages and tracebacks (which often exclude ‘.Call’ and similar).