Use negative or infinite sheet number to select sheet counting from the last #742
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Hi,
It is quite a natural interface to select the last sheet using a negative integer or infinite, one that I've seen in many packages.
Moreover, as noticed in #710, using
sheet=Inf
plainly makes the R session crash.This little PR circumvolves this problem.
Unfortunately, I could not manage to make the compiler work so I only tested that using
assignInNamespace()
.