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+* Fix `thread_mattr_accessor` share variable superclass with subclass
+
+ The current implementation of `thread_mattr_accessor` set variable
+ sharing superclass with subclass. So the method doesn't work as documented.
+
+ *Shinichi Maeshima*
+
* Since weeks are no longer converted to days, add `:weeks` to the list of
parts that `ActiveSupport::TimeWithZone` will recognize as possibly being
of variable duration to take account of DST transitions.