Re: lua 5.4 calls __gc twice, sometimes

[Payo Nel <payonel@...>]

i've let the test suite run literally millions of times now, the bug never repros when i change my proxy __gc 

before:
__gc = function(self)
  local u = cache[self]
  cache[self] = nil
  userdata.dispose(u)
end

after:
__gc = function(self)
  local u = cache[self]
  -- cache[self] = nil
  userdata.dispose(u)
end

(again, note that the cache is a weak table (mode k))
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