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On 04/11/2014 08:51 AM, duz wrote:
As this is a documented feature, and regarding the number of Lua users in world I would expect that just that will happen. Callers will be harmed that are currently protected by Lua.Unless there are __index methods out there which return multiple values already and the users are protected from them by Lua throwing them away, nobody will be caught by surprise and harmed.
To sum it up, index metamethods that return multiple values are valid. Expecting the index operator to only return one result is valid. So your suggestion would break totally valid code. It doesn't matter if this code make sense or not, all that matters to me is that this code is valid. Your suggestion breaks backward compatibility. Which is not a no-go per se but I would need good arguments to convince me to make such a change.
-- Thomas