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I suppose it's because they are about different things...
The __concat metamethod will be called when you try to concatenate things using two dots, like with strings.
And table.concat is used to get the members of a table and put them together in one string using a separator, like the contrary of a split. 

2015-09-09 22:49 GMT+02:00 Soni L. <>:

Why does table.concat not respect __concat? I wanted to make it error with a custom error message.

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