Method is

core/src/main/java/hudson/model/Fingerprint.java:178–180

Returns true if BuildPtr points to the given run.

(Run r)

         * Returns true if {@link BuildPtr} points to the given run.
         */
        public boolean is(Run r) {
            return r.getNumber() == number && r.getParent().getFullName().equals(name);
        }

        /**
         * Returns true if {@link BuildPtr} points to the given job.