code: @NullSafe
    public static boolean isPackagePrivate(Object obj) {
      return !(isPrivate(obj) || isProtected(obj) || isPublic(obj));
    }
docs: Determines whether the given object has {@literal package-private} access.
  
  @param obj {@link Object} to evaluate.  The {@link Object} must be a {@link Class} or a {@link Member}.
  @return a boolean value indicating whether the given object has {@literal package-private} access.
  @see #isPrivate(Object)
  @see #isProtected(Object)
  @see #isPublic(Object)