env = newCleanEnv()
load([[
  x = 1
  env2 = newCleanEnv()
  load("x=2", "", "t", env2)()
  assert(x == 1, x)
  assert(env2.x == 2)
  
  -- now with nil env - must default to env (not outer sandbox)
  load("x=3")()
  assert(x == 3, x)
]], "", "t", env)()
assert(x == nil)
assert(env.x == 3, env.x)
return true