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A general description is here.
An error when unloadNamespace() attempted to run the .onUnload() function gave an error in the reporting function and so was not reported properly.
Text help rendering did not handle very long input lines properly.
could fail when run on a small repository (PR#14042) .
rep(x, times, each
=2) gave invalid results when the 'times' argument is a vector longer than 'x'. Reported by Bill Dunlap.