@oskarkv Use the macro select whenever possible -- it does more optimization magic, I believe. select* may be useful in a situation where you absolutely need a function (for example, as an input to a higher-order function like map). For the most part, it's best to think of select* as an underlying implementation function, not really an important part of the end-user API. [I'm jumping in because you haven't gotten a response yet, but if anyone provides a more definitive answer, feel free to ignore mine].

gave a bit more detail answering the question on github https://github.com/nathanmarz/specter/issues/186