ModifierChar {$[⑴⁜∦⎂⎇▦⑶¨~ᛞ⑵⟒¿∺⩔⑷Ẅ∥]}

AddModifier(
      symbol = "~",
      keywords = Seq("filter:", "without-popping:", "peek:"),
      numberOfElements = 1,
      ModifierOverload(
        name = "Filter",
        args = Seq("mon"),
        description = "Filter the top of the stack with #1",
        example = "#[1|2|3|4|5#] ~2≛ -> [2, 4]",
      ),
      ModifierOverload(
        name = "Peek",
        args = Seq("dyd+"),
        description = "Apply #1 without popping",
        example = "3 4 5 ~+ -> 3 4 9",
      ),
    ),

AddElement(
  symbol = "⎊",
  keywords = Seq("map-permutations", "map-perms"),
  arity = 1,
  Options(
    vectorises = false
  ),
  Overload(
    name = "Map Over Permutations",
    args = Seq("any", "fun"),
    description = "Map {#2|#1} over all permutations of {#1|#2}",
    typeSwitchable = true,
  ),
),