Writing '15' would have been easier here. Nothing wrong with writing 0xF but it's a weird choice that irked my curiosity. You just did it for style reasons?
I will start lists and notes from 0, and have dropped a few hex expressions in my time. Sometimes I am in an odd frame of mind and maybe am just signaling that to see what others may do or say.
Another weird choice, different syntax. I triggered a little when I saw the comment too.
0xF has always been hard to read for me. $F is hard to read for others, and it all seems to depend on where and on what we all started with.