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A general description is here.
‘scan()’ now warns when end-of-file occurs within a quoted string.
‘count.fields()’ is now consistent with ‘scan()’ in handling newlines in quoted strings. Instead of triggering an error, this results in the current line receiving ‘NA’ as the field count, with the next line getting the total count of the two lines.
Quotes were handled differently when reading the first line and reading the rest, so ‘read.table()’ misread files that contained quote characters (PR#15245)