G'day. It'd be nice to extend the description and include:
Does this use a lua on_tick handler to implement the behaviour?
Does this work to/from wagons, chests, or just belts?

This is just a buffer, which is placed on a conveyor belt and stores 2 stacks. At the same time pripyatstvuj a jam on the conveyor Can work with logic. This is not my mod, the author did not want to do it under version 17, and I was very used to it and could not part). Go to https://mods.factorio.com/mod/belt_buffer watch the video in the description there are several of them, they are short and give a rough idea. I will make a more detailed description later.

Does this use a lua on_tick handler to implement the behavior?
The behavior of a vanilla loader that stores 2 stacks in a chest and gives it away when necessary.

Does this work to / from wagons, chests, or just belts?
It is put only on konveer, works as the buffer, replaces not big chest

thanks! appreciate it!

searching on youtube, i found two interesting videos :
https://youtu.be/C7aR8EqVAGk explains what a buffer belt is :-)
https://youtu.be/nCkyh2G__qQ is a mod spotlight of this mod by JD-Plays

Thank you, I will definitely add to the information on the mod page
I especially liked 1 Vedo, and the use of a Belt buffer in the dance)

the description is really good now, thanks! also, thank you for the mod.