picol: A Tcl interpreter in 500 lines of code
It appears that you've provided a link to a GitHub repository and a Hacker News discussion, but no text to summarize. If you could provide the text of the article or a brief description of the content, I'd be happy to help you create a summary for your newsletter. Alternatively, I can try to look up the content and provide a summary based on that. From what I can gather, the GitHub repository is for a project called "picol" by antirez, but without more information, it's difficult to provide a detailed summary. If you have any more context or details, please let me know and I'll do my best to assist you.