sec. 1.1 says: "both types of node structure have as their first three fields a 32-bit sxpinfo header and then three pointers [...]"
that's *four* fields, as seen in src/include/Rinternals.h:208+:
#define SEXPREC_HEADER \
struct sxpinfo_struct sxpinfo; \
struct SEXPREC *attrib; \
struct SEXPREC *gengc_next_node, *gengc_prev_node
vQ
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