code: function create(item, h)
  {
  	if (h === 0)
  	{
  		return {
  			ctor: '_Array',
  			height: 0,
  			table: [item]
  		};
  	}
  	return {
  		ctor: '_Array',
  		height: h,
  		table: [create(item, h - 1)],
  		lengths: [1]
  	};
  }
docs: Recursively creates a tree with a given height containing only the given item.