is_integer() incorrectly reports TRUE for factors

[holgerbrandl]

Example

is_integer(factor(1:3))

which gives TRUE. In contrast is.integer(factor(1:3)) reports FALSE.

Although a factor can be converted to in, it intuitively is not an integer vector. E.g. factor(1:3) + 1 results in an error: In Ops.factor(factor(1:3), 1) : ‘+’ not meaningful for factors

[lionel-]

This is expected, rlang is about base types, not conceptual types. The vctrs and funs packages might have conceptual predicates.