Circuit 'Read contents' on detached cargo wagon

[Milichip]

What?

Allow circuit network connection with 'Read contents' on detached cargo wagons (cargo wagons that are not connected to any other wagons or locomotives).

This should only apply to individual, detached static cargo wagons - or at least cargo wagons not connected to a train locomotive. Unless you decide otherwise, of course.

Why?

It is tedious to add an arithmetic combinator as well as a decider combinator next to the wagon (with 'pulse' on its inserters), which provides this functionality already but feels less "clean".
The same thing was true of assemblers, furnaces, labs, heating towers, boilers... anything that could have its inventory read this way is now circuit readable - except for train wagons.

(and yes, I am aware wagons are readable with a locomotive and a train stop, however this necessitates a massive amount of extra space - more than twice as much and is even uglier/messier of a solution, especially compared to a memory cell with pulse inserters)