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> This shows up most clearly on 32-bit ARM (which is what the IRC user who
> reported it was using); [...]
> 
> > table.concat({{}, {}}, ',')
> stdin:1: invalid value (table) at index 539390232 in table for 'concat'

A more portable example:

> table.concat({}, "", math.maxinteger, math.maxinteger)
stdin:1: invalid value (nil) at index -1 in table for 'concat'

-- Roberto