VUNSAFE
if (hs != NULL && *hs != '\0' && (flags & VUNSAFE) && !is_number(hs))
result = expandonstack(var, (flags & VUNSAFE ? 0 : 2), 0);
if (flags & VUNSAFE) /* parsing the environment */
setvareqsafe(*envp, VEXPORT|VTEXTFIXED|VUNSAFE);
vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET|VUNSAFE);