Who in the world though it a good idea putting their custom readtables into libraries intended for outside use? I don't want your hash table syntax, I want MINE. Don't pollute the readtable and other aspects of someone else's image if you're providing a library. The library you're making should be portable and clean #CommonLisp, not some unreadable #DSL you use in your #REPL. It's fine in the REPL, but not in libraries. Keep it clean. Simple courtesy.
Not pointing fingers, but everyone doing that shall be ashamed.