Tiny formatting fix in AS change log [ci skip]
Test `except!` in other cases too
Merge pull request #15434 from sgrif/sg-clear-caches

Clear all caches calculated based on `@columns` when `@columns` changes
[ci skip] Correct output of Hash#symbolize_keys
Merge pull request #15448 from akshay-vishnoi/doc_changes

[ci skip] Correct output of Hash#symbolize_keys
Fix AS::NumberHelper results with rationals

:precision was incorrectly being applied to Rationals

before:
  ActiveSupport::NumberHelper.number_to_rounded Rational(10, 3), precision: 2
  => "3.3"
after:
  ActiveSupport::NumberHelper.number_to_rounded Rational(10, 3), precision: 2
  => "3.33"
[ci skip] correct doc for ActionView::Helpers::DebugHelper
Missing period from AP/CHANGELOG [ci skip]
Merge pull request #15449 from aditya-kapoor/correct-debug-doc

[ci skip] correct doc for ActionView::Helpers::DebugHelper
Removed 'Caching with Rails' guide from WIP, this guide isn't ready to
be published and requires more attention. [ci skip]
config.assets.digests -> config.assets.digest

in Asset Pipeline guide.

[skip ci]
Merge pull request #15456 from jonatack/patch-7

config.assets.digests -> config.assets.digest
Merge branch 'master' of github.com:rails/docrails
Create Changing Columns on migrations guides

[ci skip]
Add Total of grouped items to AR query interface on guides

[ci skip]
Added missing test case for migrations when using sql structure
Merge pull request #14881 from robin850/patch-19

Swallow bundler exceptions when running tests
Don't change values in `@raw_attributes` during serialization

During `init_with`, the attributes given to the coder will be placed
into `@raw_attributes`. As such, we should read from `@raw_attributes`
when encoding, rather than `@attributes`, which has been type cast.
Merge pull request #15432 from sgrif/sg-coder-type-casting

Don't change values in `@raw_attributes` during serialization
Remove most code related to serialized properties

Nearly completely implemented in terms of custom properties.
`_before_type_cast` now stores the raw serialized string consistently,
which removes the need to keep track of "state". The following is now
consistently true:

- `model.serialized == model.reload.serialized`
- A model can be dumped and loaded infinitely without changing
- A model can be saved and reloaded infinitely without changing