FWIW I find this is the perfect question for ChatGPT/Gemini. Whenever the knowedge is somewhere on the web but hard to Google, I use these LLMs. In this case,

FWIW I find this is the perfect question for ChatGPT/Gemini. Whenever the knowedge is somewhere on the web but hard to Google, I use these LLMs. In this case, Gemini correctly points to Punycode