[R] duplicated() on zero-column data frames returns empty

[Mark Webster]

 > If you would like to try your hand at developing a patch and make a
> case for it at R-devel or the Bugzilla, the resources at
> <https://contributor.r-project.org/> can be helpful.
I am attempting to get admitted onto the Bugzilla at the moment for the data frame cases, fingers crossed!
Best Regards,Mark Webster  
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