As someone who is pretty good at allocators, if you're calling `malloc(0)` you're wandering into very undefined territory. I've seen everything from valid alloc

As someone who is pretty good at allocators, if you're calling `malloc(0)` you're wandering into very undefined territory. I've seen everything from valid allocations of non-zero length, whatever was on the stack, and just 0. The only real constraint is that free accepts the returned pointer.