hash

static VALUE
d_lite_hash(VALUE self)
{
 st_index_t v, h[4];
 get_d1(self);
 h[0] = m_nth(dat);
 h[1] = m_jd(dat);
 h[2] = m_df(dat);
 h[3] = m_sf(dat);
 v = rb_memhash(h, sizeof(h));
 return ST2FIX(v);
}