=== POSITIVE ===
// This value can be a bool or a string with the value "true" or "false".
{
  "allOf": [
    {
      "type": "string"
    },
    {
      "default": "foo"
    }
  ]
}
=== NEGATIVE ===
{
  "allOf": []
}
=== NEGATIVE ===
{
  "allOf": null
}
=== NEGATIVE ===
{
  "allOf": false
}
=== NEGATIVE ===
{
  "allOf": "foo"
}
=== NEGATIVE ===
{
  "allOf": 1
}
=== NEGATIVE ===
{
  "allOf": -1
}
=== NEGATIVE ===
{
  "allOf": 1.2
}
=== NEGATIVE ===
{
  "allOf": {}
}
