OVL_METACOPY_MIN_SIZE
if (metacopy_size > OVL_METACOPY_MIN_SIZE)
#define OVL_METACOPY_INIT { 0, OVL_METACOPY_MIN_SIZE }
if (metacopy->len < OVL_METACOPY_MIN_SIZE)
return (int)metacopy->len - OVL_METACOPY_MIN_SIZE;
res = OVL_METACOPY_MIN_SIZE;
} else if (res < OVL_METACOPY_MIN_SIZE) {