For now, there are many utility classes have the flaw that it can be instantiated by its subclasses. I've created a pull request #27933 to fix this issue, but you have closed it, and the reason is not acceptable. I think you should consider it over before make the final decision. Thanks!

Comment From: bclozel

27933 has been closed and we've explained why. If the team changes its mind we'll reopen it.

In the meantime, please don't create duplicate issues/pull requests as it's not likely to push us to reconsider this.

Comment From: scruel

27933 has been closed and we've explained why. If the team changes its mind we'll reopen it. In the meantime, please don't create duplicate issues/pull requests as it's not likely to push us to reconsider this.

Ok, I hope you will consider it again, thanks.

Comment From: scruel

@bclozel Furthermore, if you think that the throw part is the noise and want me remove it, I will do the job.