Don't rely on Arel master in bug report template

We should rely instead on the version supported by Active Record

Closes #14809

multibyte_conformance.rb --> multibyte_conformance_test.rb

"subhash" --> "sub-hash"

Few corrections in Rails Initialization Guides

Fix inconsistent behavior from String#first/#last

While calling String#first or String#last with zero or a Fixnum < the
string's length returns a new string, a Fixnum >= the string's length
returns the string itself. This inconsistency can lead to inadvertent
mutation of a string.

when a destroyed record is duped, it is no longer ´destroyed?`.

remove warning while running TEST CASES

`warning: ambiguous first argument; put parentheses or even spaces`

:uglify -> :uglifier

The name of the gem is `uglifier` and all other references
use `uglifier`, not `uglify`.

Optimize select_value, select_values, select_rows in Postgresql adapter.

Fixed has_many association to make it support irregular inflections.

Also add a Changelog entry

[related #9702]
[fixes #8928]

So that irregular multi-word pluralization rules have to be defined only for snake-case strings.

[ci skip]

CSRF protection should rescue exception not extend

Optimize select_value, select_values, select_rows and dry up checking whether to exec with cache for Postgresql adapter

Reduces creating unused objects, with the most dramatic reduction in select_values which used to map(&:first) an array of single element arrays.

Extend previous changes, include the default line from the application controller that new rails applications are created with: 
  protect_from_forgery with: :exception

Minor wording changes to align.

Related with cbb91745

This was changed at cbb91745

Remove wrapping div with inline styles for hidden form fields.

Conflicts:
	actionview/CHANGELOG.md

Use common to_io so users can access the underlying IO object

Bring SQLite3Adpter init API closer to others

I think the changes to the default behaviour mean that rails will throw an exception when an invalid authenticity token is found.  The previous proposed code of calling super then sign_out meant that sign_out was never reached - the exception handler never returned.

I think the best approach now is to catch the exception, although I'm not 100% certain on that.

Autoload ActiveModel::StrictValidationFailed

Currently, if environment doesn’t eager load code, invoking this
constant before calling #valid? on a model instance results in a
NameError.

[ci skip] Added examples for telephone_field_tag and url_field_tag methods