1 files changed, 79 insertions, 1 deletions
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 49ff2c88d0..ab5237488a 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,5 +1,83 @@
+*   Default `ActiveSupport::MessageEncryptor` to use AES 256 GCM encryption.
+
+    On for new Rails 5.2 apps. Upgrading apps can find the config as a new
+    framework default.
+
+    *Assain Jaleel*
+
+*   Cache: `write_multi`
+
+        Rails.cache.write_multi foo: 'bar', baz: 'qux'
+
+    Plus faster fetch_multi with stores that implement `write_multi_entries`.
+    Keys that aren't found may be written to the cache store in one shot
+    instead of separate writes.
+
+    The default implementation simply calls `write_entry` for each entry.
+    Stores may override if they're capable of one-shot bulk writes, like
+    Redis `MSET`.
+
+    *Jeremy Daer*
+
+*   Add default option to module and class attribute accessors.
+
+        mattr_accessor :settings, default: {}
+
+    Works for `mattr_reader`, `mattr_writer`, `cattr_accessor`, `cattr_reader`,
+    and `cattr_writer` as well.
+
+    *Genadi Samokovarov*
+
+*   Add `Date#prev_occurring` and `Date#next_occurring` to return specified next/previous occurring day of week.
+
+    *Shota Iguchi*
+
+*   Add default option to `class_attribute`.
+
+    Before:
+
+        class_attribute :settings
+        self.settings = {}
+
+    Now:
+
+        class_attribute :settings, default: {}
+
+    *DHH*
+
+*   `#singularize` and `#pluralize` now respect uncountables for the specified locale.
+
+    *Eilis Hamilton*
+
+*   Add `ActiveSupport::CurrentAttributes` to provide a thread-isolated attributes singleton.
+    Primary use case is keeping all the per-request attributes easily available to the whole system.
+
+    *DHH*
+
+*   Fix implicit coercion calculations with scalars and durations
+
+    Previously calculations where the scalar is first would be converted to a duration
+    of seconds but this causes issues with dates being converted to times, e.g:
+
+        Time.zone = "Beijing"           # => Asia/Shanghai
+        date = Date.civil(2017, 5, 20)  # => Mon, 20 May 2017
+        2 * 1.day                       # => 172800 seconds
+        date + 2 * 1.day                # => Mon, 22 May 2017 00:00:00 CST +08:00
+
+    Now the `ActiveSupport::Duration::Scalar` calculation methods will try to maintain
+    the part structure of the duration where possible, e.g:
+
+        Time.zone = "Beijing"           # => Asia/Shanghai
+        date = Date.civil(2017, 5, 20)  # => Mon, 20 May 2017
+        2 * 1.day                       # => 2 days
+        date + 2 * 1.day                # => Mon, 22 May 2017
+
+    Fixes #29160, #28970.
+
+    *Andrew White*
+
 *   Add support for versioned cache entries. This enables the cache stores to recycle cache keys, greatly saving
-    on storage in cases with frequent churn. Works together with the separation of #cache_key and #cache_version
+    on storage in cases with frequent churn. Works together with the separation of `#cache_key` and `#cache_version`
     in Active Record and its use in Action Pack's fragment caching.
 
     *DHH*