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*   Deprecate `alias_method_chain` in favour of `Module#prepend` introduced in Ruby 2.0

    *Kir Shatrov*

*   Added `#without` on `Enumerable` and `Array` to return a copy of an
    enumerable without the specified elements.

    *Todd Bealmear*

*   Fixed a problem where String#truncate_words would get stuck with a complex
    string.

    *Henrik Nygren*

*   Fixed a roundtrip problem with AS::SafeBuffer where primitive-like strings
    will be dumped as primitives:

    Before:

        YAML.load ActiveSupport::SafeBuffer.new("Hello").to_yaml  # => "Hello"
        YAML.load ActiveSupport::SafeBuffer.new("true").to_yaml   # => true
        YAML.load ActiveSupport::SafeBuffer.new("false").to_yaml  # => false
        YAML.load ActiveSupport::SafeBuffer.new("1").to_yaml      # => 1
        YAML.load ActiveSupport::SafeBuffer.new("1.1").to_yaml    # => 1.1

    After:

        YAML.load ActiveSupport::SafeBuffer.new("Hello").to_yaml  # => "Hello"
        YAML.load ActiveSupport::SafeBuffer.new("true").to_yaml   # => "true"
        YAML.load ActiveSupport::SafeBuffer.new("false").to_yaml  # => "false"
        YAML.load ActiveSupport::SafeBuffer.new("1").to_yaml      # => "1"
        YAML.load ActiveSupport::SafeBuffer.new("1.1").to_yaml    # => "1.1"

    *Godfrey Chan*

*   Enable `number_to_percentage` to keep the number's precision by allowing
    `:precision` to be `nil`.

    *Jack Xu*

*   `config_accessor` became a private method, as with Ruby's `attr_accessor`.

    *Akira Matsuda*

*   `AS::Testing::TimeHelpers#travel_to` now changes `DateTime.now` as well as
    `Time.now` and `Date.today`.

    *Yuki Nishijima*

*   Add `file_fixture` to `ActiveSupport::TestCase`.
    It provides a simple mechanism to access sample files in your test cases.

    By default file fixtures are stored in `test/fixtures/files`. This can be
    configured per test-case using the `file_fixture_path` class attribute.

    *Yves Senn*

*   Return value of yielded block in `File.atomic_write`.

    *Ian Ker-Seymer*

*   Duplicate frozen array when assigning it to a HashWithIndifferentAccess so
    that it doesn't raise a `RuntimeError` when calling `map!` on it in `convert_value`.

    Fixes #18550.

    *Aditya Kapoor*

*   Add missing time zone definitions for Russian Federation and sync them
    with `zone.tab` file from tzdata version 2014j (latest).

    *Andrey Novikov*

*   Add `SecureRandom.base58` for generation of random base58 strings.

    *Matthew Draper*, *Guillermo Iguaran*

*   Add `#prev_day` and `#next_day` counterparts to `#yesterday` and
    `#tomorrow` for `Date`, `Time`, and `DateTime`.

    *George Claghorn*

*   Add `same_time` option to `#next_week` and `#prev_week` for `Date`, `Time`,
    and `DateTime`.

    *George Claghorn*

*   Add `#on_weekend?`, `#next_weekday`, `#prev_weekday` methods to `Date`,
    `Time`, and `DateTime`.

    `#on_weekend?` returns true if the receiving date/time falls on a Saturday
    or Sunday.

    `#next_weekday` returns a new date/time representing the next day that does
    not fall on a Saturday or Sunday.

    `#prev_weekday` returns a new date/time representing the previous day that
    does not fall on a Saturday or Sunday.

    *George Claghorn*

*   Change the default test order from `:sorted` to `:random`.

    *Rafael Mendonça França*

*   Remove deprecated `ActiveSupport::JSON::Encoding::CircularReferenceError`.

    *Rafael Mendonça França*

*   Remove deprecated methods `ActiveSupport::JSON::Encoding.encode_big_decimal_as_string=`
    and `ActiveSupport::JSON::Encoding.encode_big_decimal_as_string`.

    *Rafael Mendonça França*

*   Remove deprecated `ActiveSupport::SafeBuffer#prepend`.

    *Rafael Mendonça França*

*   Remove deprecated methods at `Kernel`.

    `silence_stderr`, `silence_stream`, `capture` and `quietly`.

    *Rafael Mendonça França*

*   Remove deprecated `active_support/core_ext/big_decimal/yaml_conversions`
    file.

    *Rafael Mendonça França*

*   Remove deprecated methods `ActiveSupport::Cache::Store.instrument` and
    `ActiveSupport::Cache::Store.instrument=`.

    *Rafael Mendonça França*

*   Change the way in which callback chains can be halted.

    The preferred method to halt a callback chain from now on is to explicitly
    `throw(:abort)`.
    In the past, returning `false` in an ActiveSupport callback had the side
    effect of halting the callback chain. This is not recommended anymore and,
    depending on the value of
    `Callbacks::CallbackChain.halt_and_display_warning_on_return_false`, will
    either not work at all or display a deprecation warning.

*   Add Callbacks::CallbackChain.halt_and_display_warning_on_return_false

    Setting `Callbacks::CallbackChain.halt_and_display_warning_on_return_false`
    to true will let an app support the deprecated way of halting callback
    chains by returning `false`.

    Setting the value to false will tell the app to ignore any `false` value
    returned by callbacks, and only halt the chain upon `throw(:abort)`.

    The value can also be set with the Rails configuration option
    `config.active_support.halt_callback_chains_on_return_false`.

    When the configuration option is missing, its value is `true`, so older apps
    ported to Rails 5.0 will not break (but display a deprecation warning).
    For new Rails 5.0 apps, its value is set to `false` in an initializer, so
    these apps will support the new behavior by default.

    *claudiob*

*   Changes arguments and default value of CallbackChain's :terminator option

    Chains of callbacks defined without an explicit `:terminator` option will
    now be halted as soon as a `before_` callback throws `:abort`.

    Chains of callbacks defined with a `:terminator` option will maintain their
    existing behavior of halting as soon as a `before_` callback matches the
    terminator's expectation.

    *claudiob*

*   Deprecate `MissingSourceFile` in favor of `LoadError`.

    `MissingSourceFile` was just an alias to `LoadError` and was not being
    raised inside the framework.

    *Rafael Mendonça França*

*   Add support for error dispatcher classes in `ActiveSupport::Rescuable`.
    Now it acts closer to Ruby's rescue.

    Example:

        class BaseController < ApplicationController
          module ErrorDispatcher
            def self.===(other)
              Exception === other && other.respond_to?(:status)
            end
          end

          rescue_from ErrorDispatcher do |error|
            render status: error.status, json: { error: error.to_s }
          end
        end

    *Genadi Samokovarov*

*   Add `#verified` and `#valid_message?` methods to `ActiveSupport::MessageVerifier`

    Previously, the only way to decode a message with `ActiveSupport::MessageVerifier`
    was to use `#verify`, which would raise an exception on invalid messages. Now
    `#verified` can also be used, which returns `nil` on messages that cannot be
    decoded.

    Previously, there was no way to check if a message's format was valid without
    attempting to decode it. `#valid_message?` is a boolean convenience method that
    checks whether the message is valid without actually decoding it.

    *Logan Leger*

Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/activesupport/CHANGELOG.md) for previous changes.