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A general description is here.
As an experimental feature the placeholder ‘_’ can now also be used in the ‘rhs’ of a forward pipe ‘|>’ expression as the first argument in an extraction call, such as ‘_$coef’. More generally, it can be used as the head of a chain of extractions, such as ‘_$coef[[2]]’.
‘Rd2txt()’ now preserves line breaks of \verb Rd content. This also fixes the rendering of verbatim output from Rd \Sexpr in plain-text help.