NA and "NA" characters break convert to localDiskConn after divide

[jrounds]

Hi,

I call it an "issue". I have a data set with a 2 character code in a vector, and I noticed this scenario:

V1 = c("NA", "DO", "CO", "SH", "VA", as.character(NA))
V1
V2 = runif(length(V1))
data = data.frame(V1=V1, V2=V2)
from = divide(data, by="V1")
tmp = tempfile()
to = localDiskConn(tmp, autoYes=TRUE)
convert(from, to)
Error in getFileLocs(conn, keys) : 
  There are duplicate keys - not currently supported

The solution is either define the NA (missing) as a character string that is unused or change the "NA" character code to something else.

The nature of this error brings it all the way down to the key choice of datadr. Both the "NA" and the NA have key
"V1=NA"

To be clear, this issue is not pressing for me. I have obvious work arounds. Just thought I would note it.