[$] realloc() and the oversize importance of zero-size objects

Small objects can lead to large email threads. In this
case, the GNU C Library (glibc) community has been having an extensive
debate over the handling of zero-byte allocations. Specifically, what
should happen when a program calls realloc()
specifying a size of zero? This is, it seems, a topic about which some
people, at least, have strong feelings.