Method push

src/jvm/clojure/lang/PersistentTreeMap.java:823–830

(Node t, ISeq stack, boolean asc)

	}

	static ISeq push(Node t, ISeq stack, boolean asc){
		while(t != null)
			{
			stack = RT.cons(t, stack);
			t = asc ? t.left() : t.right();
			}
		return stack;
	}

	public Object first(){
		return stack.first();