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A general description is here.
The functions in header ‘R_ext/Callbacks.h’ (which is *not* part of the
API) have been converted to use the ‘bool’ type.
Header ‘R_exts/Utils.h’ no longer contains a declaration for ‘77_SUB(interv)’. This is intended to be called from Fortran and was wrongly declared: ‘LOGICAL’ in Fortran corresponds to ‘int *’ not ‘Rboolean *’.