DT 1.9.2 t1 <- data.table(a=1:2,b=0:1,key="a")
t1[b==0] => row 1, OK
t1[!b] => ERROR "object 'b' not found" ??
t1[(!b)] => row 1, OK
Shouldn't !b be equivalent to (!b)? They are both expressions, not symbols.
-s
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