/me looks at a pile of empty coffee capsules, /me looks at the hoodie, /me looks at the (unread) giant math is fun book, I hide in shame.
I do agree though, especially in hiring I find it weird to expect people to have their hobby being the same as their job. I'm quite curions if there is another profession where this is the case. Photographers maybe?
Pilots to some extent (the senior airline pilots who can afford to fly privately), but that is often to get back to the joy and freedom of roaming the skies at will in light aircraft vs the demanding and rigid world of commercial flying, so arguably not the same thing.
I'd say anyone who is a maker. Someone who creates things creatively.
There is a good chance your carpenter has a workshop at home. If you have the kind of mechanic who likes will modify your car, they probably do their own car too.
I feel like owning a print copy of CLRS just implies that you studied Computer Science at a university, not necessarily that you're some super gifted hacker. But then again, most people who own print copies of Shakespeare are probably not uber-Shakespeare nerds, but took some English Lit courses.
I do agree though, especially in hiring I find it weird to expect people to have their hobby being the same as their job. I'm quite curions if there is another profession where this is the case. Photographers maybe?