Followup on this. To avoid the in/not-in <array> expansion, the trick is actually to use: foo=any($1) where $1 is an array instead of in ($1, $2, etc.). !=

Followup on this. To avoid the in/not-in <array> expansion, the trick is actually to use: foo=any($1) where $1 is an array instead of in ($1, $2, etc.). != any($1) is the same as 'not in'.