fix serialization type cast when value is already unserialized
add test for 9041454def79d8e61cabe49e7c5cb72cef29138b
correct documentation about active_record behavior
Escape the string even when the condition of link_to_unless is not satisfied.
Added test for link_to_unless to make sure the result consistency.
Merge pull request #10942 from yangchenyun/mine

correct documentation about active_record.default_timezone
Use Colspan in th Tags

Is it more suitable that using ```<th colspan="3">``` instead of three empty ```<th>```? It is simple, but what i am missing about it?

Change repetitive th tags to use colspan attribute

Update CHANGELOG.md

Update CHANGELOG.md
Merge pull request #10971 from dtaniwaki/escape_link_to_unless

Always escape the result of link_to_unless method
Merge pull request #10970 from sbagdat/patch-1

Use Colspan in th Tags
Merge branch 'master' into mrbrdo-fixserialization

* master: (142 commits)
  Use Colspan in th Tags
  Added test for link_to_unless to make sure the result consistency.
  Escape the string even when the condition of link_to_unless is not satisfied.
  Add CHANGELOG entry for #10969
  Use a case insensitive URI Regexp for #asset_path
  collection tags accept html attributes as the last element of collection
  Rewind StringIO instances before be parsed again
  Use xml instead already parsed xml
  Updated the doc for const_regexp [ci skip]
  Make test name descriptive and add reference to original regression commit
  fixture setup does not rely on `AR::Base.configurations`.
  regression test + mysql2 adapter raises correct error if conn is closed.
  cleanup, remove trailing whitespace from AR changelog
  'json' gem is no more required under JRuby
  fix typos
  Fix AS changelog [ci skip]
  Update the HTML boolean attributes per the HTML 5.1 spec
  Changing const_regexp to check for constant name.
  valid_app_const? -> valid_const?
  Add CHANGELOG entry for #10740
  ...
just construct real objects rather than mock and stub