I still don't see how this is useful. The only time I want to answer the question "what type of file is this" is if it is an opaque blob of binary data. If it's

I still don't see how this is useful. The only time I want to answer the question "what type of file is this" is if it is an opaque blob of binary data. If it's a plain text file like Python, HTML, or JSON, I can figure that out by just catting the file.