lib: cleanup validation

Used the `validateInteger()` validator to cleanup validation and keep
consistency.

PR-URL: https://github.com/nodejs/node/pull/39652


Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>