[ci skip] added after_touch callback documentation [ci skip]

[ci skip] added more explanation for `after_touch` callback

We can now make use of the existent #travel/#travel_to helper methods
added to AS test case and available in all tests.

Fix typo in action_controller responder.rb [ci skip]

typos rectified lifecycle => life cycle

Comparing dates & times with other objects using #== is slow.
Internally, it hits #<=> which calls #to_datetime on objects
that don't respond to it, so we incur the cost of raising an
exception with a possibly-deep backtrace.

Cost of #jsonify on a Time object:

Calculating -------------------------------------
                 old      3644 i/100ms
                 new     12652 i/100ms
-------------------------------------------------
                 old    43373.8 (±3.5%) i/s -     218640 in   5.047017s
                 new   173437.6 (±5.2%) i/s -     872988 in   5.047747s

s/everytime/every time/

Make ActionDispatch::Request::Session#fetch behave like Hash#fetch

This reverts the changes to CHANGELOG.md in commit
38f8872a.

test description uses "disable" when it should be "disabled"

value is "disabled" not "disable"

File 'empty_bool.rb' was introduced around 4 years ago in
c10958fb to remove method redefined
warning in AS test suite, however we do not have such need for reuse
anymore, so we can safely move the constants back to the file where
they are currently used and get rid of the extra file/require.

Prevent invalid code when using dynamic finders with reserved ruby word.

activerecord-deprecated_finders expects the parameters denormalized in
its initialize method

These classes are not meant to be public.

Session#fetch was mutating the session when given a default argument
and/or a block. Since Session duck-types as a Hash, it should behave
like one in these cases.

This is to get activerecord-deprecated_finders work again

This will call primary_key two times

This reverts commit d0588a2e, reversing
changes made to 87e1e866.

It is needed for activerecord-depecated_finders

This reverts commit dcff027a, reversing
changes made to 3a209398.

It is need in activerecord-deprecated_finders

removing multiple check conditions to single check condition

Remove require 'models/administrator', Administrator is not used in secure password test

typo rectified

The dynamic finder was creating the method signature with the parameters name,
which may have reserved words and this way creating invalid Ruby code.

Closes: #13261

    Example:

        # Before
        Dog.find_by_alias('dog name')

        # Was creating this method
        def self.find_by_alias(alias, options = {})

        # After
        Dog.find_by_alias('dog name')

        # Will create this method
        def self.find_by_alias(_alias, options = {})

Using parallelize_me! to parallelize isolated test

As ParallelEach is no more available

related commit ec00442c

Fix mounting engines inside a resources block