code: public BooleanExpression notIn(Collection<? extends T> right) {
          if (right.size() == 1) {
              return ne(right.iterator().next());
          } else {
              return Expressions.booleanOperation(Ops.NOT_IN, mixin, ConstantImpl.create(right));
          }
      }
docs: Create a {@code this not in right} expression
  
  @param right rhs of the comparison
  @return this not in right