[datatable-help] i = !x different from i = (!x)

[Stavros Macrakis (Σταῦρος Μακράκης)]

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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