I have strange behaviour of filter 'unique'

I have the array in JSON format:

[
  {
      "id": 0,
      "type": "Type Zero",
      "date": "2020-02-22",
      "phone": 380001000000,
      "images":  ""
  },
  {
      "id": 1,
       "type": "Type One",
      "date": "2020-04-24",
      "phone": 380001000000,
      "images": ""
  },
  {
      "id": 2,
      "type": "Type Two",
      "date": "2020-07-08",
      "phone": 380002000000,
      "images": ""
  }
]

{%- assign model = site.data.models | map: "phone" | uniq -%}

I get: Liquid Exception: no implicit conversion of String into Integer in... hints at "phone", but is not problem i changed it to...

[
  {
      "id": 0,
      "type": "Type Zero",
      "date": "2020-02-22",
      "phone": "380001000000",
      "images":  ""
  },
  {
      "id": 1,
       "type": "Type One",
      "date": "2020-04-24",
      "phone": "380001000000",
      "images": ""
  },
  {
      "id": 2,
      "type": "Type Two",
      "date": "2020-07-08",
      "phone": "380002000000",
      "images": ""
  }
]

{%- assign model = site.data.models | map: "phone" | uniq -%}

<ul>
  {%- for too in model -%}
  <li>{{ too.id }} / {{ too.type }} / {{ too.data }} / {{ too.phone }} / {{ too.images }}</li>
  {%- endfor -%}
</ul>

....in the array model i expected get

[
  {
      "id": 0,
      "type": "Type Zero",
      "date": "2020-02-22",
      "phone": "380001000000",
      "images":  ""
  },
  {
      "id": 2,
      "type": "Type Two",
      "date": "2020-07-08",
      "phone": "380002000000",
      "images": ""
  }
]

<ul>
  <li> 0 / Type Zero / 2020-02-22 / 380001000000 / </li>
  <li> 1 / Type Two / 2020-07-08 / 380002000000 / </li>
</ul>

but in the array model i get nothing if exactly I see

Now I see only one field "phone" i do not understand where other fields...?

<ul>
  <li> / / / 380001000000 / </li>
  <li> / / / 380002000000 / </li>
</ul>

Why? Did I miss something?

No source file or test is named. Reproduce the supplied JSON and the map: "phone" | uniq template, then inspect the filter behavior and its documented output; done means the observed result and expected object shape are reconciled.