Yeah, exactly, that’s my point. How many programs have memory leaks limited to (or even just materially affected by) 0-sized allocations? I’d have to imagine its a very small minority.
They're uncommon for sure. In the past they've been an issue for me on constrained systems where they can frag the heap as badly as any other long lived allocation.
A mismatch between malloc(0) and free(-1).
You’d know nothing about calls to malloc with non-zero sizes.