1. When comparing the directory to delete against the top level
   cache_path, use File.realpath to make sure we aren't comparing two
   unequal strings that point to the same path. This occurs, for
   example, when cache_path has a trailing slash, which it does in the
   default Rails configuration. Since the input to
   delete_empty_directories never has a trailing slash, the comparison
   will never be true and the top level cache directory (and above) may
   be deleted. However…

2. File.delete raises EPERM when trying to delete a directory, so no
   directories have ever been deleted. Changing the code to Dir.delete
   fixes that.

It turns out this file is required in active_record.rb.

Remove sprockets-rails from the Gemfile generator

The dependency was introduced in this commit:

002713c6

which has been released a long time ago

Fix: Overriding attributes on `dup` by default scopes

This reverts commit 3eef1c7c.
The css compressor should be set in sass-rails plugin. Check
https://github.com/rails/sass-rails/commit/339529f9f6433047df6358c0439e6641cb74f045
for the fix.

With the new sprockets-rails we need to explicitly set the CSS
compressor.

See https://github.com/rails/sprockets-rails#changes-from-rails-3x

Custom dependency trackers for the template digestor

Improve `rake stats` for JavaScript and CoffeeScript

Ignore block comments and calculates number of functions.

Some minor AR changelog modifications [ci skip]

Added documentation to touch throwing an error

Keep second fraction when DateTime#change is called.

update 4.0 release notes to reflect the removal of auto explain.

Changed update to use prepared statements

to use it on an unpersisted object.

Raising an ActiveRecordError when one tries to use touch on a new record object

object that has not yet been persisted. This behavior follows the
precedent set by update_columns.

This reverts commit 046e27a7.
Check https://github.com/rails/rails/pull/8815#issuecomment-14026122 for
details.

AS JSON encoder: remove monkey patch of Array