If you are passing arguments like time objects that serialize to strings
but don't deserialize back automatically, inline testing was passing the
objects through raw meaning different behavior in tests vs. production.
Now the inline wrapper does a round trip through json.
Allows sidekiq jobs to run inline in test mode without having to modify
the production code. In other words production code can still call the
`perform_async` method and tests can still verify that functionality is
run inline.
