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+## Rails 5.2.0.beta2 (November 28, 2017) ##
+
+* No changes.
+
+
+## Rails 5.2.0.beta1 (November 27, 2017) ##
+
+* Changed default behaviour of `ActiveSupport::SecurityUtils.secure_compare`,
+ to make it not leak length information even for variable length string.
+
+ Renamed old `ActiveSupport::SecurityUtils.secure_compare` to `fixed_length_secure_compare`,
+ and started raising `ArgumentError` in case of length mismatch of passed strings.
+
+ *Vipul A M*
+
* Make `ActiveSupport::TimeZone.all` return only time zones that are in
`ActiveSupport::TimeZone::MAPPING`.