A integer64 is a 64 bits integer vector, implemented in the bit64 package.
# S3 method for integer64
vec_ptype_full(x, ...)# S3 method for integer64
vec_ptype_abbr(x, ...)
# S3 method for integer64
vec_ptype2(x, y, ...)
# S3 method for integer64
vec_cast(x, to, ...)
These functions help the integer64 class from bit64 in to
the vctrs type system by providing coercion functions
and casting functions.