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‘URLencode()’ will not by default encode further URLs which appear to be already encoded.
‘qbeta()’, the inversion of ‘pbeta()’, is much more sophisticated, also in border cases, still not ending in too many iterations.
HTML conversion of ‘\href’ markup in ‘.Rd’ files did not remove the backslash from ‘\%’ and so gave an invalid URL. In a related change, the ‘\’ escape is now required in such URLs.