Start date is used by Slap Tool to technically find the most important delivery.
Stop date is for informational purpose only, and this is informational purpose:
the time difference between request and allocating partition.

It allows interaction to work in correct sequence.

Business process is frozen on stopped state, changing the date will result in
compensation which is not desired in Vifib configuration.

As request is used to request destruction, ignore instances related to only
delivered cleanup deliveries.

All tests have to pass with all possible combinations of code, so virtual
separation is meaningless.

This test will allow to track progress on "securing" API -- that it will
disallow to access objects outside of its scope.

Thanks to this browser will ask for newer version of data all the time,
but server will have a chance to reply with 304 (Not Modified).