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A general description is here.
A C++ standard specification (‘CXX_STD =’) in ‘src/Makevars*’ is now checked more thoroughly. Invalid values are still ignored but now give a warning.
New function ‘Rf_isScalarString’.
New function ‘R_mapAttrib’ for iterating over the attributes of an object.
Packages using the non-API functions ‘ATTRIB’ and ‘SET_ATTRIB’ will now receive check ‘NOTE’s. See ‘Writing R Extensions’ for alternatives to use.