If does not quote table name properly, invalid SQL is generated.

Clarify default adapter in ActionCable guide  [ci skip]

The default adapter in development & test environments is not `redis` but `async`.

Docs: `tag` only accept attribute names as symbols

[ci skip] fix typo in Actionpack Changelog

Fix `warning: ambiguous first argument`

```
test/cases/adapters/postgresql/case_insensitive_test.rb:12: warning: ambiguous first argument; put parentheses or a space even after `/' operator
test/cases/adapters/postgresql/case_insensitive_test.rb:16: warning: ambiguous first argument; put parentheses or a space even after `/' operator
test/cases/adapters/postgresql/case_insensitive_test.rb:20: warning: ambiguous first argument; put parentheses or a space even after `/' operator
test/cases/adapters/postgresql/case_insensitive_test.rb:24: warning: ambiguous first argument; put parentheses or a space even after `/' operator
```

[ci skip]

See https://github.com/rails/rails/issues/26518#issuecomment-252826489

@dhh:
> I'd support symbol-only keys going forward with these new APIs.
> We can break with the past here since the tag proxy is new and so is form_with.

Set target ruby version for rubocop to 2.2 instead 2.3.

* ActionController::Parameters#deep_dup

* Tests for ActionController::Parameters#deep_dup

* Fix test for ActionController::Parameters#deep_dup

* More tests for ActionController::Parameters#deep_dup

[Rafael Mendonça França + Pavel Evstigneev]

This change will help to catch ruby 2.3+ syntax in code base. Right now, minimal ruby version set to 2.2.2 in gemspecs.

Rubocop output before:

$ rubocop
Inspecting 2133 files
.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................C............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................CC.........................................................................................................................................................................................................................................................

Offenses:

activerecord/test/cases/schema_dumper_test.rb:454:32: C: Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.
    output = dump_table_schema('infinity_defaults')
                               ^^^^^^^^^^^^^^^^^^^
guides/bug_report_templates/active_record_migrations_gem.rb:65:4: C: Final newline missing.
end

guides/bug_report_templates/active_record_migrations_master.rb:64:4: C: Final newline missing.
end

2133 files inspected, 3 offenses detected
$

After:
$ rubocop
Inspecting 2133 files
.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................C............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................CC.........................................................................................................................................................................................................................................................

Offenses:

activerecord/test/cases/schema_dumper_test.rb:454:32: C: Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.
    output = dump_table_schema('infinity_defaults')
                               ^^^^^^^^^^^^^^^^^^^
guides/bug_report_templates/active_record_migrations_gem.rb:65:4: C: Final newline missing.
end

guides/bug_report_templates/active_record_migrations_master.rb:64:4: C: Final newline missing.
end

2133 files inspected, 3 offenses detected
$

WebSocket always defers the decision to the server, because it didn't
have to deal with legacy compatibility... but the same-origin policy is
still a reasonable default.

Origin checks do not protect against a directly connecting attacker --
they can lie about their host, but can also lie about their origin.
Origin checks protect against a connection from 3rd-party controlled
script in a context where a victim browser's cookies will be passed
along. And if an attacker has breached that protection, they've already
compromised the HTTP session, so treating the WebSocket connection in
the same way seems reasonable.

In case this logic proves incorrect (or anyone just wants to be more
paranoid), we retain a config option to disable it.

Optionally allow ActionCable requests from the same host as origin

Fix case insensitive check for text column in pg

Extract `format_colspec` to format column spec

remove unused require `benchmark`

Add top level license

Remove deprecations in Active Model, Action View and Active Job

`#get`, `#set`, `[]=`, `add_on_empty` and `add_on_blank`.

Fix table comment dumping

Follow up to #26735.

If `table_options` returns `{ comment: nil }`, `create_table` line is
broken.

Example:

```ruby
  create_table "accounts", force: :cascade,  do |t|
```

`name` is not a column option

Add missing @, fix indents. [ci skip]

`migration_keys` includes `name` but `name` is not a column option.

Undeprecate plural positional argument

Remove all deprecations from Action Pack

Dump index options to pretty format

`#process`, `#get`, `#post`, `#patch`, `#put`, `#delete`, and `#head`.

Remove deprecated support for passing `:path` and route path as stings in `ActionDispatch::Routing::Mapper#match`