after_commit callbacks run after committing a transaction whose parent
is not `joinable?`: un-nested transactions, transactions within test
cases, and transactions in `console --sandbox`.

Tiny: DRY default limit in ActiveRecord::Type::Integer

Tiny: Remove incorrect comment in ActiveRecord::Type::Value

Says it's only used for the schema, but they are in fact used for
other things. Integer verifies against the limit during casting,
and Decimal uses precision during casting. It may be true that
scale is only used for the schema.

Adding tip about jQuery UJS [ci skip]

Reference #18533

[ci skip] fix typo sill -> still

Fix Typo SecureToken for schema sample [ci skip]

Time columns should support time zone aware attributes

The types that are affected by `time_zone_aware_attributes` (which is on
by default) have been made configurable, in case this is a breaking
change for existing applications.

While we don't want to change the form input when validations fail,
blindly using `_before_type_cast` will cause the input to display the
wrong data for any type which does additional work on database values.

If you entered incorrect input into a form (particularly with a
numericality validation), we should not replace what you typed in with
`0`, since clicking submit a second time would essentially be the same
as erroneously accepting the junk input as 0.

This reverts commit 787e22bb.

We should never be ignoring valuable information that the types may need
to give us. The reason that it originally used `_before_type_cast` is
unclear, but appears to date back long enough that the reasons may not
be relevant today. There is only one test that asserts that it uses the
before type cast version, but it gives no context as to why and uses a
mock which does not simulate the real world.

Fixes #18523.

Building the Arel AST, and manipulating the relation manually like this
is prone to errors and breakage as implementation details change from
underneath it.

Building the Arel AST, and manipulating the relation manually like this
is prone to errors and breakage as implementation details change from
underneath it.

This behavior exists only to support fixtures, so we should handle it
there. Leaving it in `#quote` can cause very subtle bugs to slip
through, by things appearing to work when they should be blowing up
loudly, such as #18385.

Correct the views that the mail method sends in API docs.

 Changed "in GitHub" to "on GitHub" [ci skip]

 - Followup of https://github.com/rails/rails/pull/18503.

 Fix typo in ActionView CHANGELOG [ci skip]

Changed `IN` to `ON` in markdown renderer condition

Grammar: "By default, Rails loads generators from your load path." [ci skip]

Extract `Date` header to string constant in Http Response, similar to other headers

fix link in autoloading guide [ci skip]

- Changed `IN` to `ON` in all note sentences in guides.

Before: http://take.ms/z39h2
After: http://take.ms/Mo0G3

ActiveRecord: On reconnection failure, release only failed connetion.

Fix form_for guide binding a form to an object. [ci skip]