additional note about routes in functional tests for engines [ci skip]
Properly handle scoping with has_many :through. Fixes #14537.
Add a CHANGELOG entry for the has_many :through scoping fix (See #14537 for details).
Simplify the code in target_scope
Minor improvement: Use the merge method on the relation instead of instance_eval directly.
Improve Contributing to Rails Guide

Logically group the content, so it makes more sense if someone tries to read from start of page to end of page. [ci skip]
Add documentation for Thread#freeze
Keep debugger support only for rubies < 2.0.0
Update Gemfile templates to provide correct debugger
Update debugging guide to use byebug
Instead boat load of libraries, simply say StdLib
Isolate debugger related code
Prevent generation of extra whitespace in templates
Fix error for aggregate methods with select, see issue #13648
Minor fixes in the rails debugging guide
PostgreSQL, adapter automatically reloads it's type map. Closes #14678.

[Yves Senn & Matthew Draper]
PostgreSQL, warn once per connection per missing OID. Closes #14275.

[Yves Senn & Matthew Draper]
Implement fuzzy matching for route search on routing error html page.
Improve CSS styling for routing error html page.
Split search results into 'exact matches' and 'fuzzy matches'.

- also refactored the javascript.