This reverts commit 2d6c14bc.

Fixnum and Bignum are deprecated in Ruby trunk

https://bugs.ruby-lang.org/issues/12739

Bump sdoc to 1.0.0.beta2 which includes fix to support Ruby 2.4

assigns assert the state of a controller instance what should not be
done in an integration test.

explain why autosave= disables inverse_of [ci skip]

Work around read/close race (x2)

Fix database runtimes on production log

IO#close and IO#read across threads don't get along so well:

After T1 enters #read and releases the GVL, T2 can call #close on the
IO, thereby both closing the fd and freeing the buffer while T1 is using
them.

Remove duplicated `unless current_adapter?(:SQLite3Adapter)` condition

`:text_too_big` column should be `:text`, not `:integer`

Use attribute_names over column_names

Speed up Time.zone.now

Change page:change to turbolinks:load in README.md [ci skip]

Print the proper ::Float::INFINITY value when used as a default value

Avoid bumping the class serial when invoking executor

Correct caller tracking in delegated deprecation methods

Made ActiveRecord consistently use ActiveRecord::Type (not ActiveModel::Type)

Restore missing Gemfile.lock entries

These lines were lost in https://github.com/rails/rails/pull/26695/files#diff-e79a60dc6b85309ae70a6ea8261eaf95L192.

[ci-skip] Swap method and its alias, format doc

We hit when we skip the PostgreSQL adapter.

ActiveModel::Type)

Some code was previously referring to ActiveModel::Type::*. This could
cause issues in the future if any of the ActiveRecord::Type classes were
overridden in the future.

Allow the use of listen's 3.1.x branch.

When the initial evented monitor feature was written, the latest version of listen
was the 3.0.x series. Since then the listen project has moved on to the 3.1.x series.
This patch allows the use of the new versions.

Show an "unmatched constraints" error when params fail to match constraints

Currently a misleading "missing required keys" error is thrown when a param
fails to match the constraints of a particular route. This commit ensures that
these params are recognised as unmatching rather than missing.

Note: this means that a different error message will be provided between
optimized and non-optimized path helpers, due to the fact that the former does
not check constraints when matching routes.

Fixes #26470.

Fix issue with `cache_key` when the named timestamp column has value nil