> You are right that various arithmetic operators map a pair of integer 
> arguments to various type: the power and division operators map them to 
> double precision while the the addition, multiplication, and subtraction 
> operators map them to integer results (giving NA's if the result cannot fit 
> into 32 bits).
Ah, ok, _that_ explains it, thanks a lot, I did not know that, which
is why it never occurred to me to check str(m1)!

> As for table(table(x)) being an unnatural construct, I use it all the time 
> instead of anyDuplicated to see the pattern of duplications.
Thanks for this, too.

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