JSON compatibility check for tuple

[hhkkxxx133]

Hello,

I am testing the JSON compatibility check for the tuple. There are multiple cases when adding or removing items for a tuple in JSON Schema that seem incorrect.

For example,

1. Should be backward compatible

"original": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    },
    {
      "type": "number"
    }
  ],
  "additionalItems": false
},
"updated": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    },
    {
      "type": "number"
    },
    {
      "type": "boolean"
    }
  ],
  "additionalItems": true
}

2. Should be backward compatible

"original": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    },
    {
      "type": "number"
    },
    {
      "type": "boolean"
    }
  ],
  "additionalItems": false
},
"updated": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    },
    {
      "type": "number"
    }
  ],
  "additionalItems": true
}

3. Should be forward compatible

"original": {
"$schema": "http://json-schema.org/draft-07/schema#",
"type": "array",
"items": [
  {
    "type": "string"
  }
  ],
  "additionalItems": true
},
"updated": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    },
    {
      "type": "number"
    }
  ],
  "additionalItems": true
}

4. Should be backward compatible

"original": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    }
  ],
  "additionalItems": false
},
"updated": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    },
    {
      "type": "number"
    }
  ],
  "additionalItems": false
}

5. Should be backward compatible

"original": {
"$schema": "http://json-schema.org/draft-07/schema#",
"type": "array",
"items": [
  {
      "type": "string"
    },
    {
      "type": "number"
    }
  ],
  "additionalItems": false
},
"updated": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    }
  ],
  "additionalItems": { "type": "number" }
}

6. Should be forward compatible

"original": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    },
    {
      "type": "number"
    }
  ],
  "additionalItems": true
},
"updated": {
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": [
    {
      "type": "string"
    }
  ],
  "additionalItems": { "type": "number" }
}

Let me know what do you think.

[jsenko]

I think those are valid examples and should be accepted, thanks.