Looks really interesting, thanks for sharing this.

I'm not sure whether I'll incorporate everything from C or just make it compatible with C and behind the scenes do things differently e.g instead of carrying const char */string pointers everywhere always carry the length of said data structure along with it. Or for instance push an additional pointer on the stack for memory zones, where an allocator is always present and knows it's context, sort of like __thiscall with class methods for this->.