rails--rails/activesupport/CHANGELOG.md

• truncate would return the original string if it was too short to be truncated and a frozen string if it were long enough to be truncated. Now truncate will consistently return an unfrozen string regardless. This behavior is consistent with gsub and strip.

  Before:

  'foobar'.truncate(5).frozen?
  # => true
  'foobar'.truncate(6).frozen?
  # => false
  

  After:

  'foobar'.truncate(5).frozen?
  # => false
  'foobar'.truncate(6).frozen?
  # => false
  

  Jordan Thomas

Please check 6-0-stable for previous changes.