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‘list.files()’ now has optional argument ‘fixed’ to allow literal pattern matching. Suggested and implemented by Duncan Murdoch in PR#18925.
‘substring(txt, i1, i2)’, ‘substr(..)’ and their replacement versions now accept ‘i2 = NULL’ to mean “to the end_of_string”, thus fulfilling Kevin Ushey (and others') suggestions in PR#18851.
Plain-text help (‘Rd2txt’) lacked markup for ‘\cite’d titles, which are now wrapped in single quotes.