undefine seen at: <unknown file>, line 1 Will be removed with release v6.e! Please use another way: assign a Nil; for Arrays/Hashes, assign Empty or () instead.
Will that deprecation require a conditional and two assignments for mixed data? [$a, @a, $b, %c, $c, &d].map: { .&undefine}; [$a, @a, $b, %c, $c, &d].map( { $_ = $_ ~~ (Associative,Positional).any ?? Empty !! Nil });