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A general description is here.
The ‘data.frame’ method of ‘rbind()’ gains an optional argument ‘stringsAsFactors’ (instead of only depending on ‘getOption("stringsAsFactors")’).
‘as.data.frame.vector(*, row.names=*)’ no longer produces ‘corrupted’ data frames from row names of incorrect length, but rather warns about them. This will become an error.