{
  inputs,
  cell,
}: let
  brand-ctor = name:
    assert builtins.isString name;
      v: {
        __brand = name;
        __value = v;
      };
  unbranded_name = "__unbranded__";
  unbranded_t = brand-ctor unbranded_name;
  brand-of = {
    __brand ? unbranded_name,
    __value ? null,
  }:
    __brand;
  brand-coalesce = v: if v ? __brand then v else unbranded_t v;
in {
  inherit brand-ctor brand-of brand-coalesce unbranded_name;
  brand-group = seq: builtins.mapAttrs (_: builtins.map (v: v.__value)) (builtins.groupBy (brnd: brnd.__brand) seq);
  brand-coalesce-seq = builtins.map brand-coalesce;
}