rails/activesupport/CHANGELOG.md

• 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 for previous changes.