Preallocate a Vec of 4 elements when necessary in many0!
Preallocate a Vec of 4 elements when necessary in many0!

The usual behaviour of Vec::push is to double the capacity
everytime the vec is full. This way, we always avoid one of the
allocation moves

meh/nom,AndyShiue/nom,Geal/nom,pwoolcoc/nom,sourrust/nom,Keruspe/nom