Input.unique.step: def of bend-kit-camber@0.15.0.1
Import: import bend-kit-camber@0.15.0.1/input.bend as Input
Lines 247-270 of bend-kit-camber@0.15.0.1/input.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-camber@0.15.0.1/input.bend&start_line=247&end_line=270

import Base
import bend-kit-json@0.7.0.0/json.bend as Json
import bend-kit-bytes@0.3.3.0/bytes.bend as Bytes

def unique.step(step: Walk) -> Maybe<&1, Walk>:
  match step:
    case Value{value, parents}:
      match value:
        case Json.Obj{fields}: Some{Fields{fields, Nil{}, Set.new(), parents}}
        case Json.Arr{values}: Some{Items{values, Nil{}, parents}}
        case Json.Null{}: Some{Returned{Json.Null{}, parents}}
        case Json.Flag{on}: Some{Returned{Json.Flag{on}, parents}}
        case Json.Num{number}: Some{Returned{Json.Num{number}, parents}}
        case Json.Str{text}: Some{Returned{Json.Str{text}, parents}}
    case Fields{fields, acc, seen, parents}:
      match fields:
        case Nil{}: Some{Returned{Json.Obj{List.reverse(&1, Bytes.Bytes & Json.Val, acc)}, parents}}
        case (key, value) <> rest:
          unique.borrowed(utf8.borrow(key), value, rest, acc, seen, parents)
    case Items{values, acc, parents}:
      match values:
        case Nil{}: Some{Returned{Json.Arr{List.reverse(&1, Json.Val, acc)}, parents}}
        case value <> rest: Some{Value{value, Array{rest, acc} <> parents}}
    case Returned{value, parents}:
      match parents:
        case Nil{}: Some{Returned{value, Nil{}}}
        case Object{key, rest, acc, seen} <> parents: Some{Fields{rest, (key, value) <> acc, seen, parents}}
        case Array{rest, acc} <> parents: Some{Items{rest, value <> acc, parents}}

Uses (12):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.reverse
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Set.new
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=bend-kit-bytes@0.3.3.0/bytes.bend&name=Bytes
  https://jend.leeeet.dev/definition.txt?path=bend-kit-camber@0.15.0.1/input.bend&name=Parent
  https://jend.leeeet.dev/definition.txt?path=bend-kit-camber@0.15.0.1/input.bend&name=Walk
  https://jend.leeeet.dev/definition.txt?path=bend-kit-camber@0.15.0.1/input.bend&name=unique.borrowed
  https://jend.leeeet.dev/definition.txt?path=bend-kit-camber@0.15.0.1/input.bend&name=utf8.borrow
  https://jend.leeeet.dev/definition.txt?path=bend-kit-json@0.7.0.0/json.bend&name=Val