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
Instead boat load of libraries, simply say StdLib
Use path where extensions are defined, not used

For consistency with all other documentation, point to where these core
extensions are defined, not where the example code comes from.

[ci skip]
Document LoadError core extensions

[ci skip]
Fix a few grammar issues. [ci skip]
Correct docs as singlton true is not returned here

[ci skip]
The comparison between `Relation` and `CollectionProxy` should be consistent.

Example:

    author.posts == Post.where(author_id: author.id)
    # => true
      Post.where(author_id: author.id) == author.posts
    # => true

Fixes #13506
Make the comparison between 'Relation' and 'AssociationRelation'
consistent.
Ensure that the comparison between 'CollectionProxy' and 'AssociationRelation' is consistent.
CollectionHelpers now accepts a readonly option
Missing 'are' in note - [ci skip]

This is in the note at the end of Section 2: Controller Naming Convention.  [ci skip]
Merge pull request #14725 from afshinator/patch-1

Missing 'are' in note - [ci skip]
Move tests for deep_dup and duplicable to object directory
Add a changelog entry for #14546 [ci skip]