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A general description is here.
‘optimize(f, *)’ when ‘f(x)’ is not finite says more about the value in its ‘warning’ message. It no longer replaces ‘-Inf’ by the largest _positive_ finite number.
‘R CMD INSTALL’ (and hence ‘check’) now compile C++ code with ‘-DR_NO_REMAP’.
‘Writing R Extensions’ has been revised to describe the remapped entry points, for with the ‘Rf_’ prefix remains optional when used from C code (but is recommended for new C code).