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Processing Sweave and Rd documents to PDF now renders backticks and single quotes better in several instances, including in ‘\code’ and ‘\samp’ expressions.
‘tools::pkgVignettes()’ gains argument ‘check’; if set to ‘TRUE’, it will warn when it appears a vignette requests a non-existent vignette engine.
‘utils::modifyList()’ gets a new argument ‘keep.null’ allowing ‘NULL’ components in the replacement to be retained, instead of causing corresponding components to be deleted.