Incorrect validation

[smilesrg]

I'm using schema provided below to validate content {"number":null,"country":{},"bank":{}}, content is valid but should not be.

{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "number": {
      "type": "object"
    },
    "scheme": {
      "type": "string"
    },
    "type": {
      "type": "string"
    },
    "brand": {
      "type": "string"
    },
    "country": {
      "type": "object",
      "properties": {
        "numeric": {
          "type": "string"
        },
        "alpha2": {
          "type": "string"
        },
        "name": {
          "type": "string"
        },
        "emoji": {
          "type": "string"
        },
        "currency": {
          "type": "string"
        },
        "latitude": {
          "type": "integer"
        },
        "longitude": {
          "type": "integer"
        }
      },
      "required": [
        "numeric",
        "alpha2",
        "name",
        "emoji",
        "currency",
        "latitude",
        "longitude"
      ]
    },
    "bank": {
      "type": "object",
      "properties": {
        "name": {
          "type": "string"
        }
      },
      "required": [
        "name"
      ]
    }
  },
  "required": [
    "number",
    "scheme",
    "type",
    "brand",
    "country",
    "bank"
  ]
}

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[smilesrg]

Validator considers the validation result valid if the schema is passed as a string value.