[R-Forge #5424] duplicated.data.table doesn't work with by=FALSE

[arunsrinivasan]

Submitted by: Arun ; Assigned to: Arun ; R-Forge link

duplicated.data.table documentation states that when the by argument is FALSE or NULL, it'll consider all the columns. However, by=FALSE will end up in error.

Even more, by=TRUE works the way by=FALSE should.

In an effort to fix this discrepancy, I'll remove the TRUE/FALSE dependency of 'by=' altogether and stick to by=NULL. No reason to have one logical argument working and the other ending in an error. Just more confusing.

Fix on the way.