I do know that, and based on the 1790 law, which was the only law that explicitly stated what Natural Born citizen was, and fully stated that a child who’s father was a foreign national was not a natural born citizen. Yes, Cruz would be ineligible as well.
The 1790 law was superceded by a law in 1795 which made no mention of natural born citizen.
However, by the only passed law that I am aware of that defined natural born citizen, Obama and Cruz are both ineligible.
One or two laws have addressed the subject since 1790. Start with the US Code Section 1401.
Thanks for playing.