One thing I realized that you can’t have a variable containing the name of a variable containing a filter name. What I mean is this:
<$vars asterix="[addsuffix[*]]" obelix="[addprefix[(menhir)-]]" warrior="Astérix">
<$set name=draw filter="[<warrior>match[Astérix]then[asterix]else[obelix]]">
<$set name=drawing select=0 filter="[<warrior>subfilter<draw>]">
<<drawing>>
</$set></$set></$vars>
The result is “asterix” when I wish it to be “Astérix*”.
This example is totally dumb but it was as simple as I could do it and yet show you what ca not be done yet. The possibility would help expand coding with filter names without having to add macros just for tge sake of an if or without having to distort your filter code. It would be an other possibility that some would use and some would not.
(in that dumb example, you could do the output in a more legible and more concise manner. This is not the real life code where I wrote code that required this not yet existing possibility. A complex set of code where I have to nest map inside map inside map!)