This 'not between' eventex never lets its rule fire

[0joshuaolson1]

ruleset A {
  meta {
    shares __testing
  }
  global {
    __testing = { "events": [ {"domain":"a","type":"a"}] }
  }
rule a{
  select when a a not between(a b, a a)
  send_directive("A")
}
}