public boolean remove( final Object  o ) {
    return o instanceof Integer && remove(((Integer) o).intValue());
  }
Remove {@code o} from the set.  This is the uppercase {@link Integer}
version of remove, requires a type-check and auto-unboxing.  When
possible use the {@code int} version of {@link #remove(int)} for
efficiency.
@return <tt>true</tt> if i was removed to the set.
jctools-core/src/main/java/org/jctools/maps/NonBlockingSetInt.java