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The PCRE library has been updated to version 8.00.
detach/unloadNamespace() arrange to flush the package's lazyload cache of R objects once the package/namespace is no longer needed.
There have been small fixes to the rendering of help, e.g. \command is now rendered verbatim (so e.g. -- is not interpreted, PR#14045).
Also, there are many small changes to help files where the new converters were not rendering them in the same way as before.
available.packages() 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.
[g]sub(perl=FALSE, fixed=FALSE) could use excessive stack space when used with a very long vector containing some non-ASCII data strings.