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A general description is here.
Rd2txt() could not handle empty descriptions of items in an Rd file (reported by Mark Bravington), and did not wrap long lists of arguments if they were given in a single item.
parse_Rd() would mishandle closing braces when they occurred at the start of a line within an R string in an Rd file. (Rreported by Alex Couture-Beil.)) or when they occurred in an R comment (reported by Mark Bravington).