== put five tasks
1791226839895942026-37bc
1791226839951333186-82c1
1791226840000012799-903d
1791226840048912303-5fc9
1791226840095321914-c713
STATE  COUNT  OLDEST     NEWEST    
open       5  0m00s      0m00s     
busy       0  -          -         
done       0  -          -         
aside      0  -          -         

== alice and bob take at the same instant (start barrier at a shared wall-clock time)
took 1791226839951333186-82c1
title: Reorder printer toner
took 1791226839895942026-37bc
title: Water the plants
alice holds 1, bob holds 1

== stress: 200 rounds of two simultaneous takes on fresh 2-task queues must never collide
collisions: 0

== alice finishes hers, bob sets his aside
done 1791226839951333186-82c1
aside 1791226839895942026-37bc

== carol takes a task and stalls; 3s later requeue --older-than 2
took 1791226840000012799-903d
put back 1791226840000012799-903d (was held by carol)
STATE  COUNT  OLDEST     NEWEST    
open       3  0m23s      0m23s     
busy       0  -          -         
done       1  0m03s      0m03s     
aside      1  0m03s      0m03s     

== drain the rest, then take from empty
nothing to do
exit code 3

STATE  COUNT  OLDEST     NEWEST    
open       0  -          -         
busy       3  0m00s      0m00s     
done       1  0m03s      0m03s     
aside      1  0m03s      0m03s     
  busy: 903d held by dave for 0m00s
  busy: 5fc9 held by dave for 0m00s
  busy: c713 held by dave for 0m00s
