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A general description is here.
Many more C-level allocations (mainly by ‘malloc’ and ‘strdup’) are checked for success with suitable alternative actions.
‘type.convert()’ now warns when its ‘as.is’ argument is not specified, as the help file always said it _should_. In that case, the default is changed to ‘TRUE’ in line with its change in ‘read.table()’ (related to ‘stringsAsFactor’) in R 4.0.0.