JSON Schema Failure

not_equivilent.json

{
  "id": null,
  "text": "Whatever"
}

{
  "text": "Whatever"
}

Note

Note the 'required' fields inthe schema are id + text.. however the latter json object is passing validation?

tag.json

{
    "$schema": "http://json-schema.org/draft-04/schema#"
    "title": "rebus:list - tag",
    "description": "The tag schema for rebus:list; used for creation and update of tag objects.",
    "name": "tag",
    "type": "object",
    "properties": {
        "id": {
            "oneOf": [{
                "type": "integer",
                "multipleOf": 1
            }, {
                "type": "null"
            }],
            "title": "Id schema.",
            "description": "A system generated read-only field for identifying the resource",
            "name": "id"
        },
        "text": {
            "type": "string",
            "title": "Tag text",
            "description": "Enter tag content here",
            "name": "text",
            "minLength": 1,
            "pattern": "^\\S.*\\S$"
        },
        "list": {
            "type": "integer"
        }
    },
    "additionalProperties": false,
    "required": [
        "id",
        "text"
    ]
}