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A general description is here.
Header ‘R_ext/Rboolean.h’ now defines the type ‘Rboolean’ as an alias of the standard C type ‘bool’.
Currently this is done from C (not C++) only if ‘__bool_true_false_are_defined’ is defined, which it is in C23 mode or if the C99 header ‘stdbool.h’ is included.
Before release ‘stdbool.h’ will be included from C if C23 mode is not supported, and C++ ‘bool’ will be used if called from C++.
The macro ‘_R_RBOOLEAN_IS_BOOL_’ is defined where ‘Rboolean’ is implemented _via_ ‘bool’.
‘R CMD Rd2pdf’ can now render the package manual from a ‘--latex’ installation also when the help contains figures.