We don't implement much custom marshalling logic for these objects, but
the proc default case needs to be handled separately. Unfortunately
there's no way to just say "do what you would have done but with this
value for one ivar", so we have to manually implement `marshal_load` as
well.

The test case is a little bit funky, but I'd really like an equality
test in there, and there's no easy way to add one now that this is out
of AR (since the `attributes` method isn't here)

Fixes #31216

Fix actionmailer lambda default

Fix locale_selector JS bug in ActionMailer Preview

Improve fault tolerance for redis cache store

remove text repetition

[ci skip]

Add support for connection pooling on RedisCacheStore

Update guide text not to contradict image

The bottom line in the image of `ActionController::UnknownFormat`is not
truncated. Now the text does not say it is.

[ci skip]

Support for PostgreSQL foreign tables

Fixes #31762.

Ignores a default subclass when `becomes(Parent)`

Fixes issue described in #30399: A default value on the
inheritance column prevented `child.becomes(Parent)` to return
an instance of `Parent` as expected, instead it returns an instance
of the default subclass.

The change was introduced by #17169 and it was meant to affect
initialization, alone. Where `Parent.new` is expected to return
an instance of the default subclass.

Don't perform unnecessary check with false, just use true/false values

Don't update counter cache when through record was not destroyed

bin/yarn: Pass through arguments with spaces

Use singular define_attribute_method

`define_attribute_methods` splats the arguments,
then calls out to `define_attribute_method` for
each. When defining a singule attribute, using
the singular version of the method saves us an
array and an extra method call.

#30985 caused `object.save` performance regression since calling
`changes` in `changes_applied` is very slow.
We don't need to call the expensive method in `changes_applied` as long
as `@attributes` is tracked by mutation tracker.

https://gist.github.com/kamipo/1a9f4f3891803b914fc72ede98268aa2

Before:

```
Warming up --------------------------------------
create_string_columns
                        73.000  i/100ms
Calculating -------------------------------------
create_string_columns
                        722.256  (± 5.8%) i/s -      3.650k in   5.073031s
```

After:

```
Warming up --------------------------------------
create_string_columns
                        96.000  i/100ms
Calculating -------------------------------------
create_string_columns
                        950.224  (± 7.7%) i/s -      4.800k in   5.084837s
```

Previously, the `bin/yarn` wrapper would "unquote" arguments to yarn like this:
`yarn run add-copyright "(c) 2017, 2018 MyCompany"`
That results in an ARGV of ['run', 'add-copyright', '(c) 2017, 2018 MyCompany'] in the yarn wrapper,
but a ARGV in the yarn executable of ['run', 'add-copyright', '(c)',  '2017,', '2018', MyCompany']

Use dup'ed options hash

Fix typos and improve text_helper documentation regarding sanitization

[ci skip]

[ci skip]

Enable autocorrect for `Lint/EndAlignment` cop

This was added in #31727, but it is unused.

This test case which was added in #28287 checks that
`ActiveRecord::Schema.define` loads migration versions in
subdirectories. It should be kept it as it was.

Fix minor typo [ci skip]

Updated the method counts and unified them all on numerals.

Follow up to e1473e0c