Remove duplicated HashWithIndifferentAccess#with_indifferent_access.
implement ActiveRecord::Base#pretty_print + changelog
Return a null column when no column exists for an attribute
Keep column defaults in type cast form

The contract of `_field_changed?` assumes that the old value is always
type cast. That is not the case for the value in `Column#default` as
things are today. It appears there are other public methods that
assume that `Column#default` is type cast, as well. The reason for this
change originally was because the value gets put into `@raw_attributes`
in initialize. This reverts to the old behavior on `Column`, and updates
`initialize` to make sure that the values are in the right format.
Fix regression on eager loading association based on SQL query rather
than existing column.

Fixes #15480.
Merge pull request #15492 from sgrif/sg-dirty-defaults

Keep column defaults in type cast form
Merge pull request #15172 from notEthan/active_record_pretty_print

implement ActiveRecord::Base#pretty_print

Conflicts:
	activerecord/CHANGELOG.md
Merge pull request #15349 from tgxworld/remove_duplicated_method_call

Remove duplicated HashWithIndifferentAccess#with_indifferent_access.
Merge pull request #15438 from sgrif/sg-null-column

Return a null column when no column exists for an attribute

Conflicts:
	activerecord/CHANGELOG.md
Partially revert deprecation of *_filter

We are going to deprecate only on Rails 5 to make easier plugin
maintainers support different Rails versions. Right now we are only
discouraging their usage.

This reverts commit 6c5f43bab8206747a8591435b2aa0ff7051ad3de.

Conflicts:
	actionpack/CHANGELOG.md
Convert StrongParameters cache to a hash. This fixes an unbounded
memory leak demonstrated on @tenderlove's latest blog post:

http://tenderlovemaking.com/2014/06/02/yagni-methods-are-killing-me.html
reuse available belongs_to? method

Reflection has a `belongs_to?` method. Instead of checking for
`macro == :belongs_to` throughout the source reuse existing
method.

I also bumped `foreign_key_present?` method onto on line because
the `belongs_to?` makes it shorter than other longer lines in
the same class.
Merge pull request #15499 from eileencodes/reuse-available-belongs_to-method

reuse available belongs_to? method
Merge pull request #15498 from zenspider/fix_memory_leak

Convert StrongParameters cache to a hash. This fixes an unbounded memory leak
Cleaned up duplicated CHANGELOG entry [ci skip]
Change wording of explanation about precision & scale of decimal numbers [ci skip]
Merge pull request #15482 from laurocaetano/fix-regression-for-eager-load

Fix regression on eager loading association based on SQL query rather than existing column.

Conflicts:
	activerecord/CHANGELOG.md
Merge pull request #15500 from prathamesh-sonpatki/change-wording-of-explanation-about-precision-and-scale-of-decimal-numbers

Change wording of explanation about precision & scale of decimal numbers [ci skip]