private boolean contains(Object[] raw_array, Object v) {
        for (int i = 0; i < raw_array.length; i++) {
            if (raw_array[i] == v) return true;
        }
        return false;
    }
This test demonstrates a retention issue in the NBHM implementation which keeps old keys around until a resize
event.
See https://github.com/JCTools/JCTools/issues/354
jctools-core/src/test/java/org/jctools/maps/NBHMRemoveTest.java