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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.
‘configure’ sets the ‘-std’ flag for the C++ compiler for all supported C++ standards (e.g., ‘-std=gnu++11’ for the C++11 compiler).
‘match.arg()’ more carefully chooses the environment for constucting default ‘choices’, fixing PR#17401 as proposed by Duncan Murdoch.