LRN: APRIL 19, 2024
       
       - <2024-04-19 Fri 06:59>
       
       
       usockets and the REPL
       ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
       So you've been in the REPL for a few minutes. You can see the threads
       that are running by evaluating `(bt:all-threads)'. Maybe there's a
       thread that's from yesterday, when you were futzing around with
       `usocket:server'. You can destrop that thread by evaluating
       `(bt:destroy-thread (bt:all-threads n))', where `n' is the list index
       you identified for deletion in the previous call.