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A general description is here.
as(I(1), "vector") and similar coercions from objects of "unregistered" S3 classes now work.
srcref records produced by parse() and parse_Rd() did not record the encoding of the source file. (Reported by Romain Francois.)
The X11 version of View() was misbehaving in MBCS locales, and PgUp/PgDn now behave better, thanks to a patch from Ei-ji Nakama.