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A general description is here.
R CMD check --use-valgrind did not run valgrind on the package tests.
The tclvalue() and the print() and as.xxx methods for class "tclObj" crashed R with an invalid object -- seen with an object saved from an earlier session.
R CMD BATCH garbled options -d <debugger> (useful for valgrind, although --debugger=valgrind always worked)
INSTALL with LazyData and Encoding declared in DESCRIPTION might have left options("encoding") set for the rest of the package installation.
The C utility function PrintValue no longer attempts to print attributes for CHARSXPs as those attributes are used internally for the CHARSXP cache. This fixes a segfault when calling Rf_PrintValueit on a CHARSXP from C code.
PDF graphics output was producing TWOtwo instances of anything drawn with the symbol font face. (Report from Baptiste Auguie.)
new.env(hash = TRUE, size = NA) now works, the way it has been documented to for a long time.