It's a library for detecting which character encoding a string is encoded with.

Here are the docs for the vibe-coded rewrite, and here is the version before it.

The new vibe-coded version also adds language detection; it isn't clear to me why the current version of the readme shows it classifying the string "It’s a lovely day — let’s grab coffee." as Spanish with 99% confidence, without any comment in the docs about that being a misclassification, but I guess that if the LLM-authored program says it is then that must be one of those phrases that looks the same in Spanish as in English 👀

You can ask the LLM the same question a hundred times and it might not give you the same answer it gave someone else. The way it responds is a combination of random chance and the language used to ask the question.

No, LGPL just allows linking to differently-licensed software.

Basically linking copies some code from the library into the program that uses it, making any linked software a derivative work.

Sellers of proprietary software libraries give permission for this specific type of linking in their license. LGPL gives the same permission to people who are otherwise following the GPL. LGPL used to be called the "library-GPL" because it is the GPL plus permission to use the library linking mechanism.

Nope. The LGPL simply makes an exception for programs that link with it through an API (aka when an LGPL program is used as a library).