CHARSXP.Rd
CHARSXP
is an object-like macro defining the SEXPTYPE
type of "scalar" string objects.
#define CHARSXP 9 /* "scalar" string type (internal only)*/
In Rinternals.h.
https://cran.r-project.org/doc/manuals/r-patched/R-ints.html#SEXPTYPEs