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+* Change return value of `NilClass#duplicable?`, `FalseClass#duplicable?`,
+ `TrueClass#duplicable?`, `Symbol#duplicable?` and `Numeric#duplicable?`
+ to true with Ruby 2.4+. These classes can dup with Ruby 2.4+.
+
+ *Yuji Yaginuma*
+
* Remove deprecated class `ActiveSupport::Concurrency::Latch`
*Andrew White*