[jpcfl]

Thanks. Yeah, that's my point. The naming doesn't make it obvious.

Personally, I would have called this a StackAllocator, that way the alloc/free order requirement is obvious. I would have made the default behavior to 'panic()' if you don't satisfy the precondition of freeing the most recently allocated buffer.

If somebody really wanted to make free a no-op, I'd offer a feature flag to turn that on.