Prior to Voldemort, is there any canon evidence of what would actually happen to a wizard who died with a horcrux in place? From this, did Voldemort know he would become...
"...less than the meanest ghost"
...and if so, why didn't he plan accordingly (presumably returning to power much more quickly)?
Clearly it would be much more useful to know that when you died, you were going to turn into this sort of spirit; you could probably pre-arrange to have your body restored to you within a week or two. Since Voldemort did not do this, I'm assuming he didn't know would happen to him, but I wanted to know if there was proof either way.