[pclmulqdq]

"Secret" tests have existed forever and will continue to exist. That's the nature of software. What gets pushed is only what the developer wants to maintain, not everything they did in the process of constructing and maintaining that software.

In practice "some lone developer in Iowa" will be held to the standard of quality of the original project if they want to add to it or replace it despite the support they get from the public package. Open-source software is also often not open to being pushed by any random person.