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intToUtf8() could fail when asked to produce 10Mb or more strings, something it was never intended to do: unfortunately Windows crashed R (other OSes reported a lack of resources). (PR#14068)
The HTML package index was not constructed properly when the library path was specified with backslashes. (Patch submitted by Gabor Grothendieck.)
Input from the Rgui console was changing the letter 255 (ÿÿ in Latin-2) in the character set to letter 1.