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A general description is here.
‘R CMD config’ knows the values of ‘AR’ and ‘RANLIB’, often set for LTO builds.
‘rbind.data.frame()’ allows to keep ‘<NA>’ levels from factor columns (PR#17562) via new option ‘factor.exclude’.
Additionally, it works in one more case with matrix-columns which had been reported on 2017-01-16 by Krzysztof Banas.