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2016-08-07 10:55 GMT+02:00 Dirk Laurie <dirk.laurie@gmail.com>:
> 2016-08-07 6:58 GMT+02:00 Tim Hill <drtimhill@gmail.com>:


>    local len = #setmetatable(t)
local len = #setmetatable(t,nil)

Sorry, explicit nil needed.