[Rd] Surprising behavior of letters[c(NA, NA)]

[Gabor Grothendieck]

Consider this:

> letters[c(2, 3)]
[1] "b" "c"
> letters[c(2, NA)]
[1] "b" NA
> letters[c(NA, 3)]
[1] NA  "c"
> letters[c(NA, NA)]
 [1] NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
[26] NA

The result is a 2-vector in each case until we get to c(NA, NA) and
then it unexpectedly changes from returning a 2-vector to returning a
26-vector.  I think most people would have expected that the answer
would be c(NA, NA).


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