when streaming responses, we need to make sure the cookie jar is written
to the headers before returning up the stack. This commit introduces a
new method on the response object that writes the cookie jar to the
headers as the response is committed.  The middleware and test framework
will not write the cookie headers if the response has already been
committed.

fixes #14352

Fix a grammatical error in the i18n guide

Enhance docs for update_attribute [skip ci]

Add more tests for mysql 5.6 microseconds + Fix tests

Avoid rounding problems with `.usec` method rounding the seconds when the
field doesn't persist the `.usec` piece.

Only use BINARY for mysql case sensitive uniqueness check when column has a case insensitive collation.

Conflicts:
	activerecord/CHANGELOG.md

MySQL 5.6  Fractional Seconds

You might want to branch it to include this only for 5.6, but
passing these values to < 5.6 doesn't cause issues either.

Add documentation for original_fullpath. [ci skip]

Remove mocking on save, when not necessary

Fixes STI when 2+ levels deep.

Support for PostgreSQL citext data type.

Eliminate global state leaks completely in ActiveModel tests

Removed command "application"

citext makes it possible to use AR Hash finders for case-insensitive matching as sql UPPER/LOWER functions are not needed.

PR #14052 Added a regression where it was only looking for methods in one
level up, So when the method was defined in a 2+ levels up the
inheritance chain, the method was not found as defined.

minor fix to 4.1 rel notes for begin_transaction joinable option

ActiveModel tests can now be run in random order.

Save has_one associations only if record has changes

Conflicts:
	activerecord/CHANGELOG.md

links

This will avoid the confusing flunk logic

fix minor typo 'fields_for'. [ci skip]