I'm reading an article about Chinese privacy concerns should TikTok data be handed over to US companies, wherein we have:

> 
> 事关国家安全，面对任何可能的威胁都必须零容忍。中国人民关心中国的国家安全利益，关注中国企业正当的海外利益能否得到有效保障，**这都是再正常不过的事情**，也有足够的理由质问美方的动机。  
> 
> [*人民网三评“TikTok交易”之二：浑水摸鱼，想都别想！*](http://opinion.people.com.cn/n1/2020/0924/c223228-31874006.html)，人民网，2020年09月24日
> 
> 
> 

I'm struggling to understand the grammar logic in the part highlighted in bold. [Google Translate](https://translate.google.cn/#view=home&op=translate&sl=zh-CN&tl=en&text=%E8%BF%99%E9%83%BD%E6%98%AF%E5%86%8D%E6%AD%A3%E5%B8%B8%E4%B8%8D%E8%BF%87%E7%9A%84%E4%BA%8B%E6%83%85) translates this to:

> 
> 这都是**再**正常**不过**的事情  
> 
> These are all normal things
> 
> 
> 

However, 这都是正常的事情 also has this meaning. So it looks like 再……不过 is some kind of grammar structure used to change the tone here, although I didn't find it at the [Chinese Grammar Wiki](https://resources.allsetlearning.com/chinese/grammar/%E4%B8%8D%E8%BF%87). It seems related to [再好不过](https://www.mdbg.net/chinese/dictionary?wdqb=%E5%86%8D%E5%A5%BD%E4%B8%8D%E8%BF%87) = "couldn't be better / ideal / wonderful".

**Question**: How does 再……不过 work?

(I believe I found the answer searching the web, so I thought I'd self-answer. I welcome further answers.)