Model fails when a nested attributes has a key unfriendly string keys

[neumerance]

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• I'm submitting a ...

  • bug report
  • feature request
  • support request => Please do not submit support request here, see note at the top of this template.

• What is the current behavior?
  I have a nested attributes model.

I have the field schema below

        {
          "type": "input",
          "inputType": "text",
          "inputName": "promotion[promotion_documents_attributes][][translation_attributes][zh-hk][url]",
          "model": "documents[0][translations][zh-hk][url]",
          "label": "Document url zh-hk",
          "validator": ["url"]
       }

• What is the expected behavior?
  I expected the model to be like below when you type something in the field

{
  ...,
 "documents": [
    {
      "translations": {
          "zh-hk": {
             "url": "whatever i type here"
          }
       }
    }
  ]
}

I get this instead

{
  ...,
  documents: [
    {
      "translations[zh-hk]": {
         "url": "whatever i type here"
       }
    }
  ]
}

This cause the validation not work and the model object not to what we expect.

Do you see any work around how we can handle unfriendly json keys like zh-hk