fix formatting and text for ActionController::Redirecting doc

  - `extract_precision`, `extract_limit`, and `extract_default` probably need to follow.
  - would be good to remove the delegation `Column#extract_scale`.

/cc @sgrif

- Added assertions about the column. Specifically scale.
- Move record insertion from setup into test method.

Fix polymorphic eager load with foreign_key as String.

The foreign_key could be `String` and just doing `owners_map[owner_key]`
could return `nil`.
To prevent this bug, we should `to_s` both keys if their types are
different.

Fixes #14734.

Remove redundant code.

Hash#deep_*_keys(!) recurse into nested arrays.

Conflicts:
	activesupport/CHANGELOG.md

Fixes Issue #13466.

Conflicts:
	activerecord/CHANGELOG.md

Delegate `klass` to the injected type object

Making belongs_to: touch behaviour be consistent with save updating updated_at

This reverts commit e94e6c27.

Conflicts:
	activerecord/CHANGELOG.md

The original commit was reverted only to be safe since #14407 were reported.
We don't have any proof we added a regression with the original commit
so reverting it now will give us more problem.

Closes #14407

Put attr_reader in with all of the other instance methods

Delegate `type_cast_for_write` to injected type object

Check authentication scheme in Basic auth

Inline typecasting helpers from Column to the appropriate types

Use the generic type map for PostgreSQL OID registrations

Delegate predicate methods to injected type object on Column

Use the generic type map object for mysql field lookups

Distinguish rake assets:clobber from rake assets:clean

[ci skip]