R : When using `data.table`'s DT[ i , j, by], is it possible to set the column types before hand?

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R : When using `data.table`'s DT[ i , j, by], is it possible to set the column types before hand?
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R : When using `data.table`'s DT[ i , j, by], is it possible to set the column types before hand?
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