Explain ERB space removal. [ci skip]
Time#change can now change nanoseconds (:nsec)

Closes #16392.
Rescue Rack::Utils::ParameterTypeError instead of TypeError

As of rack/rack@167b6480235ff00ed5f355698bf00ec2f250f72e, Rack raises
Rack::Utils::ParameterTypeError which inherits TypeError.

In terms of the behavior, Rescuing TypeError still works but this
method shouldn't rescue if TypeError is raised for other reasons.
Merge pull request #16758 from Agis-/time-change-nsec

Add support for `:nsec` option to `Time#change`
Merge pull request #16912 from yuki24/rescue-rack-parameter-type-error

Rescue `Rack::Utils::ParameterTypeError` instead of `TypeError`
Singular credit_card controller name changed to plural
Use dynamic path for dummy app location in plugin's test_helper.rb
Stop nil checking on safe_append=

ERB compiler guarantees safe_append= will be called with a string, so
nil checks don't make sense.  Anything else calling this method should
check for nil themselves before calling
Pare down and simplify Active Job's rake tasks
Tighten up AJ::Arguments and its tests

* Disallow deserialization of non-primitive objects
* Broaden coverage; remove superfluous tests
simplify test_adapter
Merge pull request #16918 from kiuru/master

Singular credit_card controller name changed to plural [ci skip]
Merge pull request #16920 from seuros/aj

simplify test_adapter
handle <%== nil %> cases

This is much less common than string literal appends, so add a special
case method for it.  Maybe fixes bug reported by @jeremy on 97ef636191933f1d4abc92fc10871e6d1195285c
Add `test:jobs` task
Merge pull request #16922 from y-yagi/add_test_jobs_task

Add test jobs task
add implementation of respond_to? for ActiveSupport::Duration
Merge pull request #16574 from lsylvester/duration-respond_to

add implementation of respond_to? for ActiveSupport::Duration
As of Unicode 6.3, Mongolian Vowel Separator is not whitespace

Ruby 2.2 knows this, and no longer matches it with [[:space:]], so it's
not a good candidate for testing String#squish.
[ci skip] Fix typo `equals to` --> `equal to`