Documentation for passing character NAs to .C

[Duncan Murdoch]

I can't see any mention in the docs of what happens when a character
string NA is passed to an external function.  What appears to happen
is that it is converted to the two letter string 'NA'; I can't think
of anything better to do, but this should be mentioned somewhere (or
perhaps more prominently).  

The places I thought to look were the .C help file, and section 4.2 of
the Writing Extensions manual.

Duncan Murdoch

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