I am looking for details on core variables for when (in which route) to expect it to have what value, for example $du in failure_route I've got always it to be null (I use dispatcher module). The documentation only says what type of value a pv has, but does not say what contexts they might have and where they should have what value, and what the default context is. so I was wondering where I can find some info on this.
As u might realize, I'm a bit lazy to try it myself with all possible scenarios which may effect those values. Any help would be greatly appreciated. Thank you.
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