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* Fix return value from `BacktraceCleaner#noise` when the cleaner is configured
with multiple silencers.
Fixes #11030
*Mark J. Titorenko*
* `HashWithIndifferentAccess#select` now returns a `HashWithIndifferentAccess`
instance instead of a `Hash` instance.
Fixes #10723
*Albert Llop*
* Add `DateTime#usec` and `DateTime#nsec` so that `ActiveSupport::TimeWithZone` keeps
sub-second resolution when wrapping a `DateTime` value.
Fixes #10855
*Andrew White*
* Fix `ActiveSupport::Dependencies::Loadable#load_dependency` calling
`#blame_file!` on Exceptions that do not have the Blamable mixin
*Andrew Kreiling*
* Override `Time.at` to support the passing of Time-like values when called with a single argument.
*Andrew White*
* Prevent side effects to hashes inside arrays when
`Hash#with_indifferent_access` is called.
Fixes #10526
*Yves Senn*
* Raise an error when multiple `included` blocks are defined for a Concern.
The old behavior would silently discard previously defined blocks, running
only the last one.
*Mike Dillon*
* Replace `multi_json` with `json`.
Since Rails requires Ruby 1.9 and since Ruby 1.9 includes `json` in the standard library,
`multi_json` is no longer necessary.
*Erik Michaels-Ober*
* Added escaping of U+2028 and U+2029 inside the json encoder.
These characters are legal in JSON but break the Javascript interpreter.
After escaping them, the JSON is still legal and can be parsed by Javascript.
*Mario Caropreso + Viktor Kelemen + zackham*
* Fix skipping object callbacks using metadata fetched via callback chain
inspection methods (`_*_callbacks`)
*Sean Walbran*
* Add a `fetch_multi` method to the cache stores. The method provides
an easy to use API for fetching multiple values from the cache.
Example:
# Calculating scores is expensive, so we only do it for posts
# that have been updated. Cache keys are automatically extracted
# from objects that define a #cache_key method.
scores = Rails.cache.fetch_multi(*posts) do |post|
calculate_score(post)
end
*Daniel Schierbeck*
Please check [4-0-stable](https://github.com/rails/rails/blob/4-0-stable/activesupport/CHANGELOG.md) for previous changes.
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