In most cases it works now without explicit require because it's accidentally required through
active_support/core_ext/date_and_time/calculations.rb where we still call `try`,
but that would stop working if we changed the Calculations implementation and remove the require call there.
If the [`action_text.helper` initializer][0] runs after
`ActionController::Base` has been loaded, but before the
`rails-html-sanitizer` gem has been `require`d, then the reference to
the constant `Rails::Html` in the body of the
`ActionText::ContentHelper` module raises an `uninitialized constant`
exception.
[0]: 2170338239/actiontext/lib/action_text/engine.rb (L31-L35)
