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A general description is here.
Package help requests like ‘package?foo’ now try the package ‘foo’ whether loaded or not.
General help requests now default to trying all loaded packages, not just those on the search path.
The ‘"help.try.all.packages"’ option was ignored when the shortcut syntax for help was used, e.g. ‘?foo’.
A potential segfault in string allocation has been fixed. (Found by Radford Neal.)
A potential memory protection error in ‘sort()’ has been fixed. (Found by Radford Neal.)