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A general description is here.
‘toeplitz()’ is now generalized for asymmetric cases, with a ‘toeplitz2()’ variant.
The depreated legacy typedefs of ‘Sint’ and ‘Sfloat’ in header ‘R.h’ can be excluded by defining macro ‘NO_S_TYPEDEFS’ before including the header. This is defined when using ‘R CMD CHECK --as-cran’ or by defining the environment variable ‘_R_NO_S_TYPEDEFS_’ to a true value when running ‘R CMD CHECK’.
‘default.stringsAsFactors()’ is defunct.
The undocumented legacy declarations of ‘Sint’, ‘Sfloat’, ‘SINT_MAX’ and ‘SINT_MIN’ in header ‘R.h’ are deprecated.