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* 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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