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This is a partial type used to represent logical vectors
that only contain NA. These require special handling because we want to
allow NA to specify missingness without requiring a type.
unspecified(n = 0)Length of vector
vec_ptype_show()
vec_ptype_show(NA)
vec_c(NA, factor("x"))
vec_c(NA, Sys.Date())
vec_c(NA, Sys.time())
vec_c(NA, list(1:3, 4:5))
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