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A general description is here.
The PCRE library has been updated to version 8.01, a bug-fix release.
match(incomparables=<non-NULL>) could in rare cases infinite-loop.
Quartz device did not restore clipping region when filling background for a new page. This could be observed in
tcrossprod() wrongly failed in some cases
, when one of the arguments was a vector and the other a matrix.