> On many platforms, the zero page is set up so access to it will always segfault. This isn't a language guarantee, but it's a guarantee in most modern operating systems (Linux, FreeBSD, Windows). This is set up for pointers all the way up to the end of the first page.

Then I guess it could be a language guarantee if Zig only supports/targets those platforms. However, considering how low-level Zig is, I doubt that that is the case.