stringbuffer的扩容在JDK16中和以前不同了？

我看为什么没有找到关于乘2加2的内容

 private int newCapacity(int minCapacity) {
        int oldLength = value.length;
        int newLength = minCapacity << coder;
        int growth = newLength - oldLength;
        int length = ArraysSupport.newLength(oldLength, growth, oldLength + (2 << coder));
        if (length == Integer.MAX_VALUE) {
            throw new OutOfMemoryError("Required length exceeds implementation limit");
        }
        return length >> coder;
    }

实现的方式不一样了而已。
int length = ArraysSupport.newLength(oldLength, growth, oldLength + (2 << coder));
ArraysSupport.newLength这里就是比较growth和oldLength + (2 << coder)谁大，大者加上oldLength（这样就成了2倍+2）