_PW_VERSIONED
keybuf[0] = _PW_VERSIONED(_PW_KEYBYNUM, st->version);
keybuf[0] = _PW_VERSIONED(keybuf[0], st->version);
buf[0] = _PW_VERSIONED(_PW_KEYBYNAME, use_version);
buf[0] = _PW_VERSIONED(_PW_KEYBYUID, use_version);
#define LEGACY_VERSION(x) _PW_VERSIONED(x, 3)
#define CURRENT_VERSION(x) _PW_VERSIONED(x, 4)