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A general description is here.
‘paste()’ and ‘paste0()’ gain a new optional argument ‘recycle0’. When set to true, zero-length arguments (and all zero-length or no arguments when ‘collapse’ is not ‘NULL’) lead to the zero-length value ‘character(0)’.
Fix a dozen places (code, examples) as ‘Sys.setlocale()’ returns the new rather than the previous setting.