[Rd] Bug report - duplicate row names with as.data.frame()

[Ron]

Hello,

I'd like to report what I think is a bug: using as.data.frame() we can
create duplicate row names in a data frame. R version 3.4.3 (current stable
release).

Rather than paste code in an email, please see the example formatted code
here:
https://stackoverflow.com/questions/49031523/duplicate-row-names-in-r-using-as-data-frame

I posted to StackOverflow, and consensus was that we should proceed with
this as a bug report.

Thanks,
Ron

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