By r80949, 'formatC' code in R devel has if (!(n <- length(x))) return(character())
If 'x' has length zero, the return value of 'formatC' doesn't have attributes.
It doesn't follow the documented "Value": "A character object of the same size
and attributes as x".
Based on my observation, the early return could be removed.
n <- length(x)
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