The "default" value works well for processaction but apparently does not for processallactionsinset. What am I missing?
\def\A{A}
\def\XX{}
\def\Un{Un}
\processaction[\A][A=>Yeah!,default=>Def.,unknown=>Huh?]%
\processaction[\XX][A=>Yeah!,default=>Def.,unknown=>Huh?]%
\processaction[\Un][A=>Yeah!,default=>Def.,unknown=>Huh?]
\processallactionsinset[\A,\XX,\Un][A=>Yeah!,default=>Def.,unknown=>Huh?]