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A general description is here.
‘as.vector()’ and ‘is.vector()’ have been changed in order to fulfill
‘is.vector(as.vector(.))’ more often when the argument is of type
‘list’ or ‘expression’. To this end, ‘as.vector()’ gains a
‘data.frame’ method which returns a simple list (also obeying a long
standing ‘FIXME’ to enable ‘as.vector(<data.frame>, mode="list")’.
‘as.vector()’ gains a ‘data.frame’ method which returns a simple named list, also obeying a long standing ‘FIXME’ to enable ‘as.vector(<data.frame>, mode="list")’. This will break code relying on ‘as.vector(<data.frame>)’ to return the unchanged data frame.